Welcome to YT. I'm sorry you went through this terrible and scary event with your puppy. I don't know how old your kids are and what they understand, but if your puppy is in pain or has a sore neck and muscles, his only way to communicate is to growl and bite to protect that region when touched. I think it would be good to give your puppy some time away from the children to heal, then maybe reintroduce them when he's feeling better. If your kids are older they should understand the importance of giving him some time and space as he heals.
__________________ Shelly and the girls Moka Mylee |