Gator is 15 weeks old now and I just brought him a brother home this weekend. He's 12 wks and his name is Booger. He's a Brussels Griffon. They are just great together. They both have their own large crates, side by side where they stay during the day. House breaking them so far has been effortless. I have a Cairn and Westie as well and this I believe has also helped to house break them. They just follow the grownups. I say go for two....