I have a different definition of nip. I mean biting motion at the air nowhere near the skin (coulld be feet away from anyone). A dog could nip at the air in joy as he is playing with a toy. Our dog only does it when he is poked at repeatedly and his low growls have been ignored repeatedly. The dog is not a problem, he is not a nippy dog (if you mean a little dog that bites people). He is a very friendly dog that likes every one. Getting bit can be either the animal or the child's fault or both and child can be taught how to behave around an animal to make the animal happy and minimize the risk of getting bit. I was kidding about boys liking scars (but it is true).
What would you do if you were repeatedly poked , you said stop and the person didn't stop. You weren't allowed to move. You would esculate your behavior. You might try being scary (growl more, nip at the air). It is good that dogs show behaviors that let you know to stop rather than going to just biting behavior. Kids can learn that a growl and esculating growls with nips in the air means you are doing something the dog doesn't like and get back.
I have been a foster for several different rescue organizations and have had as many as 5 dogs in our home when my 3 kids were young and we lived in 2 bedroom apartments or houses. The rescue organizations never had a problem with it. They liked our family because I was good with socializing dogs with kids.
You don't need to feel sorry for my DIL She gets anything and everything she wants. She chooses to work. She decided to get pregnant. She decided to work after she has the baby. She didn't tell me I was going to have to take care of a newborn when they talked me into coming to live with them. She decided we are moving from Tucson to Vegas. She picked the 2 bedroom apartment we are living in now. She will pick where we live in Vegas. She makes ALL decisions. She decides at the last minute what will be done on holidays. She doesn't tell anyone her plans, you have to be available to do what she wants when she wants. She never shows gratitude or says thank you to anyone. My son makes no decisions yet is responsible for everything. She doesn't do anything around the house except make messes. My son is so discouraged and worn out. He works full time as a phlebotomist for the Red Cross. He works irregular hours, travels all over AZ, and is sometimes gone overnight.Usually I am invisible when she is around. I do what she asks even if it is unreasonable.
The only thing they have to do for me is make sure one of them has Tuesday off every once every 3 weeks so one of them can drive me to the infusion center to get my gamma globulin IVs for immune deficiencies and pick me up 8 hours later. I've been going to this infusion center 4 years and my nurses are my friends. I'm usually the only patient because of my risk of infection. We order out for lunch and have a good time. I'm not supposed to drive and someone has to take care of my grandson while I am at the infusion center. I usually feel bad tin the evening and for a couple of days - headache and flu-like symptoms but I can function.
What I bring to our family is vital - free child care, a car, and my disability income. They only have one car. Babycenter says the average for home day care is $650 a month. I take care of my grandson at least 60 hours a week so even if you didn't add extra for overtime that would be $925 plus my disability would be $1699 and they use my Jeep, they would have to buy another car if I wasn't here. That's $20,000 a year and a free car!