World Building and Talking Animals

What do you think are some of the common pitfalls that can come with introducing talking animals into your world? Particularly, if there are also other animals of their type who can't talk?

For example, it might still be perfectly acceptable for humans to eat non-talking chicken - whereas for humans to eat talking talking chicken would be tantamount to cannibalism. But what about talking chickens themselves eating non-talking chicken? That very thought probably can't help but squick many of us out.

Another pitfall would be dealing with the issue of human supremacy in a world with talking animals, and whether ot it's portrayed as a bad thing. I think that was a major issue with the Chronicles of Narnia series. On one hand, eating a talking stag was established to be a major taboo - but, on the other hand, there was also this overwhelming idea that the country of Narnia should be governed by humans.

So what are your thoughts?