Instructions
Care for your existing dog. Bathe your existing dog, feed him and take your dog for walks. If you keep caring for your existing dog, you will unlock new breeds that have a resemblance to the existing dog you have been caring for.
Go to "Bark Mode." Choose a friend with the breed of dog you want to unlock and meet up with the friend. When you leave "Bark Mode," you will receive that new breed.
Gain trainer points. If you gain 2000 points, you will receive a new breed. Gain trainer points by rubbing a dog's belly, entering your dog in a dog contest, and using play items to entertain your dog.