This is a topic that dog trainers usually feel very strongly about. As a professional dog trainer in Sydney, I've noticed how little most people know about choosing a responsible breeder or puppy mills. Some people have never heard of either. Puppy mills are horrible places (photo above) where dogs have no other reason but to produce puppies. Their health, physical and mental, feeding, space and whole lives are neglected. Puppy mills are interested in nothing but making money, making an as big profit as possible with the lowest costs possible. Getting a puppy from a puppy mill is a very bad idea, you won't be saving the pup's life, you are supporting their business, creating the need for it. And you will most likely end up with a fearful, timid, sick puppy. And where do you get puppy mill pups? From pet stores, back yard breeders and even some official breeders can be considered puppy mills. This is why you should do some research and choose a responsible place to get a puppy from.