My mother-in-law is a former mail carrier and my son was bitten by a dog last year. In my son's case, the ER contacted the animal control officer in an attempt to verify that dog's rabies status as it was an unknown animal. However, from what my mother-in-law has told me, they are not required to report if the dog's rabies status is known. In her case, the several times she has been bitten, the post office handled everything in terms of verifying rabies status (they actually have a dog bite coordinator on staff and through the union). Depending on the circumstances/severity of the bite - it could be a DCYF issue versus a mandatory reporting situation. I've had students who got minor bites from their own dogs or cats and I called the parents to make sure that they were aware. If the kid's story checked out with the parent's story then I let it drop. I have reported to DCYF once in the past because the bite was extremely concerning and the parents were very nonchalant about it. The student made the dog out to seem very aggressive.
Good luck - I know that's clear as mud.
the rabies law is https://www.dhhs.nh.gov/dphs/holu/documents/hom-rabies.pdf
Are NH school nurses required to report a dog bite (when the child has presented to your office for treatment) to the the local PD? It is my understanding that an ER must do so.