A lot of petshops get their animals from mills, dogs cats and small animals are bred in this way, which are than sold at a very young age with some of them carrying disease. Best is not to buy from petshops but from someone you know.

Same goes with any animal. You guys might or might not have seen cat mill and small animal mill pics, those small animal mills are even worst than the dog mills, coz the breeders just house hundreds together regardless of if they fight and kill each other or not.