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People are not breeds of dogs.
The genetic similarity between a human and a cat is 90%, and it would be about the same for a dog.
Humans call different kinds of dogs or cats ‘breeds’, but they never liked the idea that humans were similar to other animals, so they preferred to use the word ‘race’. Some humans don’t even like to admit there are different races, but that's ridiculous, as any non-religious biologist will explain.
We can easily see the difference between a member of the Caucasian race and the Mongoloid race, so too we can easily see the difference between Gala and Golden Delicious apples, Siamese and Manx cats or poodles and pugs. Any five year old can do that.
A true poodle is a true poodle because they have bred for generation after generation to have certain traits.
The same thing happens with any group of animals or plants that are isolated from others, and only reproduce within their own group. If humans evolve that way for hundreds of thousands of years they end up as separate race. This is basic evolution, which you probably didn’t study by the sound of it.
Do you believe a geneticist would claim to be able to look at a person on the street and identify the 2, 3, 4, 8 sources of DNA in that person?
If the person is a member of a particular race, and is not mixed, then yes, that task is easy for any geneticist. He can recognize this man’s race, and this one’s, and so on, very easily. I once met a gentleman at work who I recognized immediately as a member of the Kalahari bushmen tribe in Africa. I asked him if I was right and he confirmed it. He said that yes, his parents were Kalahari bushmen, but he had been raised in Australia. He was very easy to recognize, since many of the Kalahari bushmen have very similar traits. He told me that many people asked him about this, as his features were easy to recognize. When we see Chinese people it isn’t hard to figure out they are from China, and so on. It’s not a big deal.