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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.
Your pup will need to potty about 5-20 minutes after eating, sleeping or playing. When you take your puppy outside to potty, to to the same spot each time and don't play. You want your puppy to focus on one thing only during puppy potty training -- going in the right area. As soon as your puppy potties, praise enthusiastically. Give your puppy a small food treat to reinforce the positive behavior.