LOL, funny. And if he doesn't have ears what's the headset for? About the teeth then Chicken's can actually have teeth, at least it's in the genes they found, or maybe it was an extint chicken species that had teeth. something like that.
And of course then there's the thing with Chuck's eyes never being seen, just like Beetle Bailey (although Mort did draw them once, but it wasn't published until many years later in a special).
Frank