I have two GP Mutts and two pure breds, Retriever and Chihuahua. My GP mutts are smarter and easier to train. The pure bred Retriever just wants to play fetch, which is what he was created for. The Chihuahua just wants to be petted and lay around all day, for the same reason....
My mutt is half border collie, half purebred miniature Lab.
Just about the harriest beast I ever met, I found one of his hairs on the floor and it measured 14 inches.
My neighbor insists my hound is smarter and more likeable than alot of people he meets. At 13, he's doing fine.