Puppies nip, they growl, they play and they mouth. Some even do the air snapping. Until the puppy is taught that it's not ok they do it. If a kid plays with a dog on occasion and is able to do this, then it's ok in their mind. There really isn't no in between, they either are allowed or aren't allowed. Generally if allowed the child will laugh, scream, or even run and the dog thinks it's the greatest game in the world. It's the parents job to protect and teach both the child and puppy. Puppies end up in the shelter all the time because they nipped at the kids. I know my male GSD ended up in a kill shelter because of this very reason. He was really close to dying because the parents didn't take control. At 8 months old he already spent half his life in the shelter and got kennel cough twice. He almost didn't even make it to the adoption floor because he was sick. He was still mouthing when I got him home but it was me and my son who is an adult, he never touched any of the younger kids in the house. After a week of being taught it wasn't acceptable he stopped the mouthing. He is amazing with kids and adores all of them. I can only wish that the people who gave him up and almost costed him his life could see him today. They would kick themselves for not spending a little more time teaching him what was right and wrong.
Misty- Samoyed Mix, Tannor- Golden Retriever CGC
Robyn- GSD CGC, TC, Midnite-GSD CGC,TC, Brennan-Golden Retriever CGC, Batman-Husky/Greyhound , Apollo-GSD