I am really sorry for you all (and especially for Ponza) that you have had to come to this decision. I have been through exactly the same situation and still regret the decision I made to rehome our other Boxer years ago. This was before I really understood what I do now about dog behavior and before I found BW. Had I known then what I know now I would never have given Samson up without a fight (and a behaviorist's help.) He is in a good home with a friend now, but I will never really get past the feeling that I failed him and gave up to quickly. I say all this so you will know I am not judging you, I only want to let you know that there are options you can try before surrendering him to someone else. Like Gmacleod said, dogs will give warnings over time, and when they are ignored or unnoticed the behaviors they use to try to communicate will escalate. It sounds like you have made your decision, but I just want to tell you that should you decide to ever get another dog, you could be facing the same things all over again unless your children learn what are acceptable behaviors with dogs and what are not. My son is 6 years old and has been raised with our 9 year old Boxer, it took time and diligence, but he was taught not to hug, jump on, or do threatening things and I do trust my boxer as much as a dog can be trusted. But we have to realize, they are DOGS. As much as we may think that they "should know better" and should never snap or growl, dogs have boundaries, and when they are not respected, they will do things that dogs do to protect themselves. For anyone to safely maintain a household with pets and children, one must be unfailingly diligent, something that I learned the hard way, but I can say that learning the things I have learned from books and BW now I know what needs to be done for peaceful and happy coexistence. I am sorry I am rambling, but I know how heartbreaking it is to make a decision like this, I hope that everything works out, whatever you decide to do.