
Bill M. answered 03/27/19
I have taught genetics at Rutgers University.
There is way more diversity in insects and bacteria than there are in dogs, or any other mammal.
Dogs are not special. You're just familiar with them.
Yes. Humans have bred other mammals for years. Cows, horses, sheep, all the livestock that you can think of have been bred selectively to be more useful.
Let me know if you have any questions.