An evolution question I've often wondered about.

[Reasonable]

It's called selective evolution (sometimes I think artificial). Basically, we've selected for the dogs who gets to breed, removing the environment, etc. almost completely from the picture. One of the interesting elements of selective breeding is that you can change species pretty quickly vs say natural evolution where changes take a long time to happen.

Of course, if we were to also bring genetic manipulation into the equation alongside selective evolution, I guess we could change species ever faster.