I am the foster mom of a beautiful male who required amputation at our local shelter due to severe injury to a rear leg. He has been with us for over a month now and has become one of the family. He is a wonderful dog in almost every way. The almost is that just in the last week or so, he has growled and charged the neighbor children when they are playing with my son. It is when they are running or yelling and playing. The same children have played ball and petted him many times. Now, they are afraid of him and I have to say that I am worried myself. I have read many of your posts and have to say that my dogs are not "trained". I have never had a dog that had this type of behavior before. I realize that if I were planning to keep Cole, working with a trainer would be the ideal, but I need a quick fix for the situation I am in right now. We are in a neighborhood where the houses are right on top of each other and my son and the neighbors are used to just running into each other's yards. I would appreciate any advice.