Living with multiple dogs brings a  whole new set of challenges. Adding a second (or third, or fourth) dog  means more fun, more love, more joy and more wonderful doggy companionship. But it also means much more from you: more time, more  money, more energy, and more working through problems.
Pay  attention to the type of dog that your dog likes as well. While many  puppies and young dogs play with just about anyone who will engage, mature dogs often have a few select friends. Notice the personalities  of your dog’s friends. For example, pay attention if your dog generally  does well playing with quiet females, but avoids rowdy  adolescents.