Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to train a pitbull puppy [title] Know your breeder. [step] Pit bulls can have wonderful temperaments if they are bred for this quality and not for fighting. [substeps] If the breeder tells you they train guard dogs, you may want to choose a breeder who breeds for family pets.

Ending1: Most puppy owners choose a purebred pit bull. [title] Choose a female pit bull that temperament and traits grow with every age. Ending2: Find out if the breeder has a reputation for selling dogs with hip dysplasia or cataracts-2 common afflictions in pit bulls. Calling previous owners, reading reviews on the internet and talking to your local animal shelters is important due diligence. Ending3: [title] Listen to your dog's howl. [step] Pitbulls howl out of fear of predators and/or to establish hierarchy. Ending4: [title] Choose a puppy that is not naturally aggressive and persistent. [step] You want your pit bull to have an athletic and energetic temperament in order to be an effective akc guard dog.

Answer format: ending1/ending2/ending3/ending4