What type of dog is it? Mate had a dog that would snap if it didn't want to do something he ended up having the thing put down. I'd wack the f****r soon as it made a sound towards me let it know that it's not ok to do that and see if it changes the thing if it dosnt change or gets worse pts as if the kids tell it to do so one day it may not just growl abit. Also like has been said try a treat or something make it so it's worth it for the dog for a week or so then faze it out again and hope that it's sorted