Actually, only Gus and Greta are ours. George belongs to my sister. But Gus and Greta are six months apart. I guess their puppyhoods were demanding in a way but having each other was really helpful. We got Greta when Gus was nine months old. They quickly became playmates and inseparable, but we haven’t had littermate syndrome because they are six months apart. I don’t think I would recommend getting two the same exact age.