[ A dog is a wolf is a dog is a wolf is a dog......... ]
I see yer point...
BUT an Ostrich is not a Chickadee... is not a Pheasant.. is not a Hummingbird...
Those are different ‘species’ of birds, all avian, but incompatible DNA for the most part. There are many different types of ‘chicken’, but they are all ‘chickens’, what we would normally call ‘races’.
We have many, many types of ‘dogs’, but they are all descendants of domesticated wolves, from millenia ago. They still have the same pattern of DNA, and so will still mate and produce viable offspring.
Man has crossed horses and zebras, but they produce infertile offspring, just as horses and donkeys produce sterile mules. These are true ‘hybrids’..........