My yorkie was driving the old dachshund crazy, so that's the reason we got the new dachshund. It would give Molly someone to play with. At that time, we weren't expecting to get Kirby (bichon). Molly and Muffin (new dachshund) seem to have set up a system where when it's just the two of them they play really well together. But add Kirby and it's him driving one of them crazy or he teams up with one of them against the other - it gets really crazy at times.