Sometimes my puppy will bite her foot. I can't tell if she is bored or playing, but the bite looks fairly aggressive which is odd to me since it's herself she is biting. She does like to nibble on toys and furniture (which we do not let her on the furniture), so I'm trying to understand if this is normal behavior. She is fairly hyper a lot of the time.
Here is a video of her chewing her foot (I'd upload it, but imgur doesn't like it).