OPINION
DIANE M. HENSON, Judge.
This appeal arises from a suit for conversion filed by Shalanda Augillard alleging that Tiffany Madura and Richard Toro1 wrongfully exercised dominion and control over Augillard’s black cocker spaniel, Jazz, who was recovered from New Orleans in the wake of the Hurricane Katrina disaster in August of 2005.2 Madura [496]*496responded that while she did adopt a dog that had been rescued from New Orleans, her dog, Hope Floats (“Hope”), is not the same dog that Augillard lost in the flood. The case was tried before the court, which found that Augillard failed to prove by a preponderance of the evidence that the dog in question was Jazz and entered judgment in favor of Madura. Augillard asserts on appeal that the trial court erred in disregarding conclusive evidence, including forensic DNA analysis, establishing that Hope and Jazz are the same dog and in denying Augillard’s request for injunc-tive relief. In two points of error, Augil-lard challenges the legal and factual sufficiency of the evidence supporting the trial court’s judgment. Because we conclude that the evidence is legally insufficient, we reverse and render judgment in favor of Augillard.
BACKGROUND
This case began in May 2006 when Au-gillard filed suit for conversion, seeking a temporary restraining order and an injunction in an effort to have the dog she believed was Jazz returned to her. After several hearings on Augillard’s motions, the court ordered that the dog remain in Madura’s possession but enjoined Madura from moving the dog outside of Hays County. The case proceeded to trial in June 2007.
The central issue at trial and the only disputed issue on appeal is whether Augil-lard’s dog, Jazz, and the dog that Madura adopted from New Orleans after Hurricane Katrina, Hope, are in fact the same dog. In an effort to prove Jazz’s identity, Augillard offered two DNA tests and expert testimony regarding Jazz’s and Hope’s similar medical conditions, as well as her mother’s and her own testimony that each of them had personally identified Hope as Jazz.
At trial, Augillard testified that she left Jazz in her mother’s care when her job with Federal Express required her to stay at the New Orleans Airport and oversee the delivery of evacuation supplies. She testified that her mother was eventually required to evacuate her home by the National Guard and was not permitted to take Jazz onto the rescue boat.3 Augillard’s mother then left Jazz on the second floor of her home with several weeks’ worth of water and food. Augillard explained that after the hurricane, she was among the first civilians permitted to reenter the city, and she immediately went to her mother’s house to try to recover Jazz. Finding the door kicked in and Jazz missing, Augillard began contacting local shelters, online pet registries, and organizations that had been set up to facilitate post-Katrina pet recovery. Eventually, Augillard was put in touch with Andy Odam of PawMatch.com, a website that Augillard believed had post[497]*497ed a picture of Jazz.4 Augillard testified that Odam refused her repeated requests to see the dog and to verify that it was her missing pet. Despite not being able to see the dog in person, Augillard testified that she immediately recognized Jazz from the photographs because she had raised the dog for the last eight and a half years, from the time that Jazz was only a few weeks old. Augillard eventually learned from her contacts in cocker spaniel rescue groups that the dog from the website had been brought to Hays County, Texas.5
Augillard also testified concerning Jazz’s medical history. She stated that for about six years, Jazz had suffered from thyroid problems, a skin condition that caused thinning of Jazz’s hair, and bladder problems that resulted in Jazz’s frequent urination and the occasional appearance of blood in her urine. Professional photographs that Augillard had taken of Jazz in 2003 or 2004 were admitted into evidence and showed that Jazz’s hair was thinning around her neck and the lower portion of her body, which Augillard testified was a “fairly common” condition for Jazz. The trial record also contains a portion of Jazz’s veterinary documents (those that survived the flood), which indicate that Jazz (1) had been administered her shots and vaccinations, (2) received regular physical examinations, (3) was prescribed several different medications, including Cephalexin and Neopredef powder, and (4) had been regularly bathed and groomed.
On cross-examination, Madura’s counsel attempted to call into doubt Augillard’s assertion that Jazz and Hope are the same dog. Noting Augillard’s prior statements that Jazz was in “excellent physical condition” as of August 29, 2005, and that Jazz had suffered from chronic health issues, specifically “thyroid illness” and “urinary tract problems (kidney stones),” Madura’s counsel cited evidence that when Hope arrived in Austin, she was suffering from a serious and apparently untreated case of hypothyroidism and had two abnormally large bladder stones, rather than kidney stones.6 Counsel further emphasized that [498]*498Hope’s skin condition resulted in her having a very strong and distinctive odor, although Augillard had testified that Jazz had no unusual smell, other than a “slightly stronger urine smell.”
Further testimony regarding the dog’s medical conditions was offered from Dr. Tom House and Dr. Garrett Donop, the two veterinarians who treated Hope after she arrived in Texas. House was the first to treat and diagnose the dog after she was relocated to the Hays County area. He testified at trial that Hope, an older cocker spaniel, “was obese, had thin hair coat, [and] had been clipped fairly recently.” He explained that the dog exhibited several conditions that are
fairly common in an older cocker spaniel. The thin coat goes along with [hypothyroidism. Bad ears — cockers are known for bad ears. Those are typical for any cocker spaniel you see. This one did have diarrhea, which wouldn’t be surprising not having — not knowing what it had eaten in the last several days. [The dog had] some internal parasites as well as fleas. The dog did have some evidence of staph infection in the skin. And certainly the staph infection in the skin and the yeast infection in the ears would go along with being in the water, especially in a [hypo]thyroid dog.
House testified further that the dog “was probably well taken care of,” evidenced by the fact that she had been groomed recently and had been given heartworm-prevention medication. When asked whether he had detected the golf-ball-sized bladder stones, House testified that he examined the dog’s bladder but did not feel any stones.
Madura’s veterinarian, Dr. Donop, testified that Madura brought Hope in for an examination in September of 2005 after the dog showed signs of having a bladder problem. He stated that Hope presented as “a happy dog” who was overweight and had “seborrhea or greasy skin, kind of thin-haired greasy skin,” which he suspected was the result of hypothyroidism. He testified that when he first examined Hope, he performed an ultrasound examination, which is done for all “urine-tract-prone animals,” and that he found no bladder stones at that point. After problems continued for several weeks, Donop took x-rays, revealing two “larger than golf-ball-sized stones” that he had not previously detected.
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OPINION
DIANE M. HENSON, Judge.
This appeal arises from a suit for conversion filed by Shalanda Augillard alleging that Tiffany Madura and Richard Toro1 wrongfully exercised dominion and control over Augillard’s black cocker spaniel, Jazz, who was recovered from New Orleans in the wake of the Hurricane Katrina disaster in August of 2005.2 Madura [496]*496responded that while she did adopt a dog that had been rescued from New Orleans, her dog, Hope Floats (“Hope”), is not the same dog that Augillard lost in the flood. The case was tried before the court, which found that Augillard failed to prove by a preponderance of the evidence that the dog in question was Jazz and entered judgment in favor of Madura. Augillard asserts on appeal that the trial court erred in disregarding conclusive evidence, including forensic DNA analysis, establishing that Hope and Jazz are the same dog and in denying Augillard’s request for injunc-tive relief. In two points of error, Augil-lard challenges the legal and factual sufficiency of the evidence supporting the trial court’s judgment. Because we conclude that the evidence is legally insufficient, we reverse and render judgment in favor of Augillard.
BACKGROUND
This case began in May 2006 when Au-gillard filed suit for conversion, seeking a temporary restraining order and an injunction in an effort to have the dog she believed was Jazz returned to her. After several hearings on Augillard’s motions, the court ordered that the dog remain in Madura’s possession but enjoined Madura from moving the dog outside of Hays County. The case proceeded to trial in June 2007.
The central issue at trial and the only disputed issue on appeal is whether Augil-lard’s dog, Jazz, and the dog that Madura adopted from New Orleans after Hurricane Katrina, Hope, are in fact the same dog. In an effort to prove Jazz’s identity, Augillard offered two DNA tests and expert testimony regarding Jazz’s and Hope’s similar medical conditions, as well as her mother’s and her own testimony that each of them had personally identified Hope as Jazz.
At trial, Augillard testified that she left Jazz in her mother’s care when her job with Federal Express required her to stay at the New Orleans Airport and oversee the delivery of evacuation supplies. She testified that her mother was eventually required to evacuate her home by the National Guard and was not permitted to take Jazz onto the rescue boat.3 Augillard’s mother then left Jazz on the second floor of her home with several weeks’ worth of water and food. Augillard explained that after the hurricane, she was among the first civilians permitted to reenter the city, and she immediately went to her mother’s house to try to recover Jazz. Finding the door kicked in and Jazz missing, Augillard began contacting local shelters, online pet registries, and organizations that had been set up to facilitate post-Katrina pet recovery. Eventually, Augillard was put in touch with Andy Odam of PawMatch.com, a website that Augillard believed had post[497]*497ed a picture of Jazz.4 Augillard testified that Odam refused her repeated requests to see the dog and to verify that it was her missing pet. Despite not being able to see the dog in person, Augillard testified that she immediately recognized Jazz from the photographs because she had raised the dog for the last eight and a half years, from the time that Jazz was only a few weeks old. Augillard eventually learned from her contacts in cocker spaniel rescue groups that the dog from the website had been brought to Hays County, Texas.5
Augillard also testified concerning Jazz’s medical history. She stated that for about six years, Jazz had suffered from thyroid problems, a skin condition that caused thinning of Jazz’s hair, and bladder problems that resulted in Jazz’s frequent urination and the occasional appearance of blood in her urine. Professional photographs that Augillard had taken of Jazz in 2003 or 2004 were admitted into evidence and showed that Jazz’s hair was thinning around her neck and the lower portion of her body, which Augillard testified was a “fairly common” condition for Jazz. The trial record also contains a portion of Jazz’s veterinary documents (those that survived the flood), which indicate that Jazz (1) had been administered her shots and vaccinations, (2) received regular physical examinations, (3) was prescribed several different medications, including Cephalexin and Neopredef powder, and (4) had been regularly bathed and groomed.
On cross-examination, Madura’s counsel attempted to call into doubt Augillard’s assertion that Jazz and Hope are the same dog. Noting Augillard’s prior statements that Jazz was in “excellent physical condition” as of August 29, 2005, and that Jazz had suffered from chronic health issues, specifically “thyroid illness” and “urinary tract problems (kidney stones),” Madura’s counsel cited evidence that when Hope arrived in Austin, she was suffering from a serious and apparently untreated case of hypothyroidism and had two abnormally large bladder stones, rather than kidney stones.6 Counsel further emphasized that [498]*498Hope’s skin condition resulted in her having a very strong and distinctive odor, although Augillard had testified that Jazz had no unusual smell, other than a “slightly stronger urine smell.”
Further testimony regarding the dog’s medical conditions was offered from Dr. Tom House and Dr. Garrett Donop, the two veterinarians who treated Hope after she arrived in Texas. House was the first to treat and diagnose the dog after she was relocated to the Hays County area. He testified at trial that Hope, an older cocker spaniel, “was obese, had thin hair coat, [and] had been clipped fairly recently.” He explained that the dog exhibited several conditions that are
fairly common in an older cocker spaniel. The thin coat goes along with [hypothyroidism. Bad ears — cockers are known for bad ears. Those are typical for any cocker spaniel you see. This one did have diarrhea, which wouldn’t be surprising not having — not knowing what it had eaten in the last several days. [The dog had] some internal parasites as well as fleas. The dog did have some evidence of staph infection in the skin. And certainly the staph infection in the skin and the yeast infection in the ears would go along with being in the water, especially in a [hypo]thyroid dog.
House testified further that the dog “was probably well taken care of,” evidenced by the fact that she had been groomed recently and had been given heartworm-prevention medication. When asked whether he had detected the golf-ball-sized bladder stones, House testified that he examined the dog’s bladder but did not feel any stones.
Madura’s veterinarian, Dr. Donop, testified that Madura brought Hope in for an examination in September of 2005 after the dog showed signs of having a bladder problem. He stated that Hope presented as “a happy dog” who was overweight and had “seborrhea or greasy skin, kind of thin-haired greasy skin,” which he suspected was the result of hypothyroidism. He testified that when he first examined Hope, he performed an ultrasound examination, which is done for all “urine-tract-prone animals,” and that he found no bladder stones at that point. After problems continued for several weeks, Donop took x-rays, revealing two “larger than golf-ball-sized stones” that he had not previously detected. Donop was permitted to testify, over Augillard’s objection, that the size of the bladder stones indicated that the condition should have been diagnosed earlier because “you aren’t going to grow these sized rocks in a week’s time.” He further stated that he believed Hope’s glandular condition was due to her hypothyroidism, which also causes a dog to have a “strong” odor.
Donop was asked on cross-examination whether the dog’s skin condition could have been exacerbated by stress, and he testified that stress could increase both the severity of the skin condition and the growth of bladder stones.
In addition to the testimony comparing Jazz’s and Hope’s medical conditions, Au-gillard also called Dr. Joy Halverson, an expert in the field of DNA analysis and the director of QuestGen Forensic Laboratory.7 Halverson testified concerning two DNA tests that she performed in this case. In the first analysis, which was admitted into evidence, Halverson compared DNA material from Hope with DNA extracted [499]*499from one of Jazz’s dog brushes.8 According to Halverson, the test showed a complete match at all seventeen DNA markers with a likelihood ratio exceeding one trillion, meaning that “it is a trillion times more likely that the samples match because they came from the same dog” than because the samples “came from different dogs and match by chance.”9
Halverson testified that the second test, which was conducted a month later, compared Hope’s mitochondrial DNA to the mitochondrial DNA taken from Madison, a cocker spaniel born to the same mother as Jazz.10 The results showed that Hope and Madison have the same mitochondrial type, which occurs when two dogs are maternal relatives, and that Hope and Madison could therefore have the same mother. Halverson testified that her lab’s database contains a fairly diverse number of mitochondrial types for cocker spaniels and that, given the vast extent to which cocker spaniels have been bred in the United States, mitochondrial types among the cocker spaniel breed are more diverse than among other breeds. She further stated that the mitochondrial type shared by Hope and Madison is not shared by any of the other cocker spaniels in the database.
Halverson admitted on cross-examination that it was “potentially true” that there could be a chain of cocker spaniels who would all be related through the mother’s DNA and that such a chain could consist of hundreds of dogs spanning several generations. She clarified that in practice, however, there is generally not such a “concentration of certain mitochron-drial types,” and she rejected counsel’s suggestion that perhaps even “thousands” of cocker spaniels would share the same mitochondrial type, i.e., that they would all derive from a single maternal relative.
Madura also testified at trial. She stated that she picked up Hope from Andy Odam on September 26, 2005, and that the dog “smelled really, really bad,” “her hair was very thin everywhere and gone in many spots,” and “she was urinating blood.” Madura testified that Hope was diagnosed with hypothyroidism, had been prescribed Cephalexin, and had two large bladder stones removed. Madura also submitted photographs of the dog that were taken within a month after Hope was [500]*500rescued. She testified that the photographs show Hope’s “skin condition on her neck and [a] little bit on her back,” explaining that while the photographs did not fully depict it, “the hair loss was all over the body with the exception of her head and her legs.”
At the conclusion of the trial, the court entered a take-nothing judgment as to Au-gillard’s claim,11 making the following findings of fact and conclusions of law:
The main disputed issue involved whether or not Augillard owned the property, i.e. the dog. Augillard failed to prove the case by a preponderance of evidence. The testimony of Augillard’s witnesses was not credible.
A reasonable fact finder could not find that the D.N.A. evidence presented by Augillard has been authenticated or identified thus indicating a high potential for tampering.
Augillard now appeals.
DISCUSSION
Augillard asserts that the evidence is legally and factually insufficient to support the trial court’s judgment because she conclusively established every element of her claim for conversion. We agree.
When a party attacks the legal sufficiency of an adverse finding on an issue on which she has the burden of proof, she must demonstrate on appeal that the evidence establishes, as a matter of law, all vital facts in support of the issue. Sterner v. Marathon Oil Co., 767 S.W.2d 686, 690 (Tex.1989). In order to establish conversion of personal property, a plaintiff must prove that (1) she owned or had legal possession of the property or entitlement to possession; (2) the defendant unlawfully and without authorization assumed and exercised dominion and control over the property to the exclusion of, or inconsistent with the plaintiffs rights as an owner; (3)the plaintiff demanded return of the property; and (4) the defendant refused to return the property. Apple Imports, Inc. v. Koole, 945 S.W.2d 895, 899 (Tex.App.Austin 1997, writ denied). It is undisputed that Madura exercised dominion and control over the dog, Augillard demanded return of the dog, and Madura refused to return the dog to Augillard. Therefore, as the trial court correctly determined, resolution of this matter turns on whether Augillard established that she owned the dog, thereby making Madura’s possession unlawful.
The trial court found that Augil-lard failed to prove that Jazz and Hope are the same dog and thus failed to prove ownership. In reviewing the legal sufficiency of the evidence, we must credit evidence that supports the verdict if a reasonable factfinder could and disregard contrary evidence unless a reasonable fact-finder could not. City of Keller v. Wilson, 168 S.W.3d 802, 827 (Tex.2005). Under our legal-sufficiency review, we cannot disregard contrary evidence that conclusively establishes the opposite of a vital fact. Dow Chem. Co. v. Francis, 46 S.W.3d 237, 241 (Tex.2001) (per curiam) (court must first examine record for evidence supporting verdict, ignoring all evidence to contrary; if there is no such evidence, court then examines entire record to see if contrary finding is established as matter of law). “Proper legal-sufficiency review prevents reviewing courts from substituting their opinions on credibility for those of the jurors, but proper review also prevents jurors from substituting their opinions for [501]*501undisputed truth. When evidence contrary to a verdict is conclusive, it cannot be disregarded.” City of Keller, 168 S.W.3d at 816-17. This is equally true when the factfinder is the trial court, rather than a jury. See id. at 816 n. 66 (citing Murdock v. Murdock, 811 S.W.2d 557, 560 (Tex.1991)). While the factfinder is the sole judge of credibility, decisions regarding credibility must be reasonable, and the factfinder is not permitted to ignore undisputed testimony that is “clear, positive, direct, otherwise credible, free from contradictions and inconsistencies, and could have been readily controverted.” Id. at 820.
Augillard argues that it was error for the trial court to ignore uncontroverted DNA evidence conclusively establishing that Hope and Jazz are the same dog. The results of the first DNA analysis confirmed that the sample collected from Hope was a “perfect match” to the material Halverson extracted from Jazz’s dog brush, establishing to a very high degree of scientific certainty that Hope and Jazz are the same dog. Madura neither offered contrary DNA evidence nor disputed the validity of this perfect DNA match. While it is “impossible to define precisely when undisputed evidence becomes conclusive,” as the court explained in City of Keller, “undisputed contrary evidence becomes conclusive (and thus cannot be disregarded) when it concerns physical facts that cannot be denied.” Id. at 815.
Rather than challenge the results of the DNA test, however, Madura asserts that the sample purportedly obtained from Jazz was in fact taken from Hope, pointing to the trial court’s finding that the DNA evidence was not “authenticated or identified thus indicating a high potential for tampering.” However, Madura cites nothing in the trial record that would support the allegation that the DNA evidence had been tampered with, nor have we found any evidence in the record to support such a claim. In fact, the uncontradicted evidence at trial was that Augillard did not have an opportunity to obtain a DNA sample from Hope. It was undisputed that Augillard and her family members did not have contact with Hope after the May 30, 2006 temporary injunction hearing at which Augillard’s counsel first requested DNA testing with the trial court. It was also undisputed that the only contact Au-gillard and her family had with Hope prior to that hearing was on May 5, 2006, when they were permitted to see the dog as she was being transported to the Dog Camp kennel. There was no evidence that they brushed the dog or, for that matter, that they were ever alone with the dog on that day; Augillard’s attorney and a county constable were also present when Augil-lard and her mother were with the dog.12
[502]*502In this respect, we think Madura’s challenge to the DNA evidence presents a situation analogous to that in Murdock. In Murdock, an alleged father challenged the court’s finding of paternity and judgment ordering him to pay child support after blood tests excluded him as the biological father of a child born to his ex-wife during their marriage. 811 S.W.2d at 558. The mother did not object to the admission of the blood tests at trial or attempt to dispute their validity. Rather, she testified that she never had sexual relations with any other men during the marriage and that her ex-husband had always treated the child as his own. Id.
Despite the fact that the blood tests were admitted without objection and showed that Murdock had not fathered the child, the court of appeals held that the evidence was legally insufficient to establish that the tests were “properly conducted” and affirmed the judgment of the trial court. Id. at 560. Reversing the court of appeals, the Texas Supreme Court held that “[o]nee the trial court receives blood test results into evidence, they are admitted for all relevant purposes just like any other piece of evidence.” Id. The supreme court concluded that the evidence offered by the alleged father was conclusive proof that he was not the father of the child and that he was therefore entitled to judgment in his favor. Id.
Likewise, the trial court in this case admitted into evidence Dr. Halver-son’s DNA analysis establishing to a very high degree of scientific certainty that the two samples she tested were from the same dog. Madura’s only objection to the first DNA analysis was based on a sanctions motion alleging that she had not been properly allowed to depose Halverson; however, she made no objection to the admission of the DNA test on the basis that it was inauthentic or that the samples had been subject to tampering.13 Nor did Madura attempt to rebut Augillard’s DNA evidence by calling into question the methods used to conduct the analysis, offering [503]*503another DNA analysis showing that Hope and Jazz are not the same dog, or having another expert challenge the results of the DNA test proffered by Augillard. She did not offer any testimony or evidence at trial indicating that the sample from Jazz had been tampered with or was inauthentic, nor did she cross-examine Augillard or her witnesses regarding Augillard’s version of the dog brush and sweater’s chain of custody. The record before us is devoid of any evidence that contradicts the items’ chain of custody as testified to by Augil-lard, her mother, and Dr. Halverson.14
Once it admitted into evidence the DNA analysis confirming that the dog in Madu-ra’s possession is in fact Augillard’s dog, the trial court erred by choosing to disregard that evidence, which was conclusive of the vital fact of the dog’s ownership. Madura’s subsequent attempts to cast doubt on the authenticity of the samples amounted to no more than “mere surmise or suspicion,” see Ford Motor Co. v. Ridgway, 135 S.W.3d 598, 601 (Tex.2004), that Augillard had somehow extracted a DNA sample from Hope and planted it on items belonging to Jazz; such conjecture will not sustain the verdict in the face of conclusive, uncontroverted evidence establishing the dog’s identity — evidence that a reasonable factfinder could not have disregarded. We sustain Augillard’s first issue.
While we also agree with Augillard that the evidence is factually insufficient to support the judgment, because of our disposition of her first issue, we need not reach her second.15
CONCLUSION
Because we hold that the evidence is legally insufficient to support the judg[504]*504ment of the trial court, we reverse and render judgment in favor of Augillard.
Concurring Opinion by Justice PATTERSON.