okay so these are the four breeds ive come up with in my search. i want to get 2 puppies in the future.. one for me and one for my brother.. we already have a medium size dog (26 pounds) and a cat. i just have these questions about them which breed would best to get in a pair? would any of them not get along with my other dog? or my cat? i really would prefer a breeder.. i think i will be showing one of the or both the dogs in small shows.. the only major requirment (set by my mom) is that they have to be under 15 pounds. Does anyone have any questions to help determine the best pick for my family?