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Originally Posted by Lovetodream88  She keeps saying this but my research has yet to find a reliable source that says that is true. I am pretty sure it was made up by people or the breeders of mixes. |
There is a term called hybrid vigor which is an increased vigor or other superior qualities arising from the crossbreeding of genetically different plants or animals. It is used in the breeding of some animals to produce superior offspring. Offspring may to be larger and have other desirable traits, however, hybrid vigor refers to breeding a different species to each other, dogs are the same species just different breeds and too genetically similar to benefit from hybrid vigor. Also, many of the same ailments trouble most of the toy breeds, so breeding them together wouldn’t have any advantage. "So, the next time you hear about hybrid vigor and how mutts are healthier, remember this: hybrid vigor as related to dogs is a myth."
For more information see:
Hybrid Vigor