Well, to be honest with you, I think people feed peanut butter to dogs mostly because it's funny to watch them eat it! But on a more serious note, it could be dogs like it because it contains lots of protien which dogs like (dogs are carnivorous, meat eaters, and meat contains lots of protien and therefore, they are attracted to foods that also contain it). Another interesting fact is that dogs cannot really taste the food they eat, but they can smell out what nutritional value the food has, that is why, if you have noticed, most dogs won't eat lettuce among other things because it has little or no nutritional value. And that is also why dogs will eat some pretty disgusting things such as vomit and feces. To add onto that, ... because a dogs sense of smell is so much greater than ours as humans, things that smell good to us, actually smell bad to a dog, and the disgusting things smell good to them. Pretty wierd huh?
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