You thought wrong.
Try doing a slow search, and reading slowly and carefully, and you'll be less likely to be wrong again in the future
Jack
PS: All you have to do, if you make a duplicate, is change the duplicate into a new, usable dog. There is no reason to delete a thing. Moreover, if you're adding dogs correctly, which means searching correctly by entering in JUST the dog name (e.g., Jeep) first, you will pull up EVERY dog named Jeep in the next step ... and can check to see if the right dog is already in there BEFORE you actually enter a thing.
Every time you enter in a duplicate dog, all it means you're not following instructions.