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About 8, 9, 10 weeks. After about 8, 9, 10 weeks of age, or when the puppy arrives at it's new home, the dog should be taught to go potty outside. Do not have paper or potty pads inside your home. Peeing is for outside only, or you are teaching your new pup it is okay to potty inside your home.
Starting at 12 weeks old, begin bringing your pup outside to a designated potty area. Say potty and once he eliminates in the area, give him a tasty treat and praise him. If he doesn't eliminate, bring him back in and try again after 15 minutes.