I'm not sure if it's useful to speak of a domesticated animal's raw "intelligence" by citing how they interact with humans.

"Little evolutionary pressure" means "little NORMAL evolutionary pressure" for animals protected by humans. That is, surviving and propagating is less about withstanding normal natural situations, and more about successfully interacting with humans.

So, sheep/cows/dogs/etc. might have pools of genius in the area of "find a human that will feed you," and may be really dumb in almost other areas.