2.Dyed Treats, Dyed treats or food may color your hamster's pee.
3.Loud noises such as.
Vaccums.
Carpet Cleaner Machines etc.
4.A bunch Hamsters together, if one hamster is sick then all the hamsters will get sick.
5. Holes in walls. if you are playing with your hamster on the floor and close by is a hole in a cabinet or wall your hamster will go in the hole and explore. so be careful i know from experience and always keep an eye and stay close to your hamster when playing with it.