A Lab pooch, Bull, features a coat colored like that of a calico feline.
The Lab is a patient at Texas A&M Veterinary Medical Teaching Hospital.
Shots of this dog with unique, but amazing markings, went popular recently.
Bull is believed to be a chimera due to his unique coat.
Wikipedia identifies a chimera as ?a single organism (usually an animal) that is composed of two or more different populations of genetically distinct cells that originated from different zygotes involved in sexual reproduction."
In layman's terms a chimera is one particular animal that genetically is two animals, i.e. a dog that is also his very own twin.
Bull is apparently a chimera both black Labrador and yellow Lab.
Bull has become the dog version of Venus The Amazing Chimera cat, minus the same dead-even colored split in the middle of her face. Venus' the ?two-faced" calico chimera cat caught the Internet's interest 2012.
Another explanation may be that when Bull was conceived a phenomenon called somatic mutation happened. The type of thing tends to occur more commonly in Labrador and Golden Retrievers; no one has found out why, and the mutation is not inherited.
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