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Use a verbal command on walks. Praise your dog. Gradually reduce food treats.
Try associating a verbal command with your dog's chosen bathroom spot, or with any spot that you pass immediately after leaving the house. You can say something like, "Go potty," or "Go pee" every time he urinates in that spot. Over time, your dog will hear that command and recall the associated act of urinating. Whenever your dog follows your command of "go potty" when you let him outside, immediately praise him and give him a treat within three seconds of the positive behavior. It's important to follow rewards or praise immediately after positive behavior, as dogs have a hard time associating actions and praise if too much time has passed. As your dog's training continues, you may want to slowly reduce the frequency of food treats after he relieves himself, eventually phasing them out altogether. Treats are an important and helpful part of training early on, but rewarding your dog with food every time he relieves himself should not become a lifelong habit.