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Hello. Thanks for the question.
Your dog should actually have 10 nipples. Male and female dogs both have 10 nipples- 5 on each side. There are two thoracic sets, 2 abdominal sets and 1 inguinal set. Some male dogs actually have 2 "false nipples" on each side of the prepuce next to the penis.
I think the nipples have always been there, you're just now seeing them. If you want to post a picture for me to look at and double check, I'd be happy to do so. You can attach it on this thread.