It's against my religion to physically hurt any living thing.
My mum's boyfriend recently adopted this Staffy cross (some ugly looking thing) and it just chews EVERYTHING!
My shoes, my clothes, news papers, my school bag, any piece of clothing.
He seems to be more interested in chewing everything but his chew toys.
He is pretty big and he's only five months old, he is like three times the size of my Chihuahua and loves to chew on him, but he doesn't know he's hurting my baby or my cat. :S
So sometimes I just feel like tapping him up the side of his head with a shoe but I won't because I just remind myself he'll grow out of it.
So don't feel bad you're not the only one, just remember he/she doesn't know better and they'll learn it's just like us when we were young. We didn't know drawing on the walls was bad but we did it because it was fun.