10. Ferrets
Ferrets have qualities of both cats and dogs (although there are big differences too) which is why they are becoming popular. They are small yet playful and remain so during all their lives. Unlike dogs, they do not need to be taken for a walk at 2 a.m. and yet they are extremely social and litter trainable. Ferrets sleep around 15-20 hours a day and depending on their neutered state, they go by different names.
