Currently I have 2 chihuahua's, one male, one female, both neutered. They are fun loving dogs, though the male can be a bit of a barker at times in terms of letting people know his territory and all but once he gets use to another dog, he tends to rattle down and before long they are playing around and having fun. I have had these two dogs for about 5 years for the boy and two+ years for the female. I've also watched my brothers 3 mid-size dogs when he goes out of town here and there and all is fine with everyone. The dogs do great together.