Not all Nadath are born with intellect. In fact, about half of all the demon hounds are little more than vicious animals with supernatural tracking instincts and can't even walk on two legs like their smarter siblings. Their appearances vary, so some look fairly canine, others have horns sprouting where their eyes should be, eyes where they shouldn't be etc. They're chaos demons, what do you expect?
Not all Nadath are born with intellect. In fact, about half of all the demon hounds are little more than vicious animals with supernatural tracking instincts and can't even walk on two legs like their smarter siblings. Their appearances vary, so some look fairly canine, others have horns sprouting where their eyes should be, eyes where they shouldn't be etc. They're chaos demons, what do you expect?