Incorrect, wolves are canis lupus while Chihuahuas and all other dogs are Canis lupus familiaris a subspecies of canis lupus.<quoted text>
Wolves and Chihuahuas are still the same species. As are all dogs and coyotes. No macroevolution.
But the Chihuahua and wolf are at the edge of speciation, you aren't suggesting wolves and Chihuahua's breed are you?
Though it maybe possible, I hardly see how , without human help this could happen. So in fact it is evidence of evolution.
Whether dumbassed cowboys like it or not!