I’m not so sure it’s the right course of action personally. Most of my pets have torn me to shreds at one time or other from the age of about 6. Unless the pet was able to kill me (none were) it was treated as a learning process – don’t do this or you’ll get bitten as X’s don’t like to be surprised etc. There’s a difference between a reactionary nip, regardless of location, and a purposeful chomping.
Try having ferrets for pets, most evenings I’m with them I come away with bleeding fingers/wrists and that’s just from rough play, no ill intent from them at all.
But of course you know your dog best, so you’ll know if he’s likely to do it again or feel it’s something you can’t teach your child not to do.
Even a cat. When I was in my teen I used to teased my old pet cat by softly flicking it’s balls, yes, I did that … when it got angry it would chase me around to terrorise me with its claws and I kid you not for trying to do that to an old tom cat. The cat was about 8 yrs old. A wonderer and Handsome.
While I agree with the content of your post, this paragraph looks like something one of the search engine make-a-page-from-nonsense-that-looks-like-sentences results show.