when you are looking for a breeder, make sure they don't just breed, make sure they show their dogs. Good breeders only want the best so they are careful breeding and are breeding for not only conformation, but to better the breed health wise. for large breeds they will have the hips cleared by a group called the orthopedict foundation of america OFA, also they may clear the elbows too. This is done for the parents of the pups. Also ask if they cleared the parents for hearts. If they are reputable they will know what you are talking about, If they don't what you are talking about, walk away. I don't care what anyone says too you, every dog has medical problems inherant with thier breed. Be very aware of what to look for. Also every breed has a national club with a website, once you have narrowed your choice down to 2 or 3 do your research and go to these national clubs. Breeders in good standing will be members and you can talk to them. Reputable breeders love their breed and will talk to you forever and will answer any question, Ask about their sales contract and their requirments. if they have none walk away. I never let a pup go without a sales contract. Make sure that in their contract it says that if for any reason you can't keep the dog at any time in its life, they will take it back. That was one of my stipulations for a sale. I knew where every one of my pups went and where and when they passed from this life. It also shows that a good breeder will not just sell you a pup, but will be there for the long haul. You are a new dog owner and will need all the support a good breeder can give, also all the breed knowledge on your breed they have.