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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.
Potty training can range from about 3-4 weeks to maybe a month, Depending on the breed, it can vary. An eager to please and intelligent breed such as a lab or collie should pick up on the pattern pretty quickly. Also having a schedule for the puppy to go outside is ideal. Picking up a routine for a puppy is almost as important as having a routine for a baby. Just keep at it! Potty training works best using a crate/kennel. During the day let your puppy roam around, take her out to potty outside several times. At night, put her in the crate and you dont take her out until you know you're ready to take her outside for her morning walk. Wait for her to do #1 and #2 and take her back inside.