I took Xena to the vet yesterday and the vet told me that my breeder just had another litter of puppies!! 2 fawn females and 2 brindle males. My question is....we had a really tough time with Xena's housebreaking but she was an "only child" so to speak. Since we now have her and shes 3 1/2 years old, will it be easier to train the new puppy, since she has a role model...like will Xena help to show her how an older dog should act?? Would a male be easier or a female?? Any and all help is appreciated!!