What is the smallest mammal pet?

I was curious to what the answer would be so did some research,in a previous post someone said one of the shrews were the smallest mammals in the world,well they were correct according to the stuff I looked at. The animal is called Etruscan Shrew, it has a few other names as well but to me that is pretty interesting. It is good to know that even though tiny you can still be cute and people will want you!