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If you'd like to teach your puppy to signal when she needs to go outside, try using a bell at the door. It's an easy trick to teach and would be better than teaching her to bark. Simply hang a bell by the door low enough for your puppy to nose or bat with her paw. Every time you're ready to take her out, use a familiar command like, "Go outside!" and ring the bell yourself. Your puppy will soon associate the bell ring with going outside.
The next step is to encourage your puppy to ring the bell herself. Start with the familiar command, "Go outside!" Entice your puppy to ring the bell and offer her a treat or praise every time she does so. Then immediately take her outside to eliminate.