I have 2 dogs @ this time. Baron is a 16 m.o. Yorkie and Sammy is a 7 1/2 y.o. Papillion. I am adding 2 female Yorkies to the family in May. Then we will have 4. The boys get along great and the girls are each a little over a year old and are spayed. I can't wait to have them all together. Go for it, The more the merrier...