First of all, you need to know whether the biting is really from aggression, or if it is over-excited playing. Puppies love to play, and part of the playing process.
With hamsters being one of the most common pets for all people, there are a lot of questions raised about why they die. More often than not, you will find.
If you have noticed that your pet rabbit can't move its back legs, it is likely to be either hind limb paralysis (complete inability to move its legs) or paresis.