help with a rescue dog

I agree with Rhonda, Find a board certified behaviorist to help you. Putting it back up for adoption is not an option. If your children are in danger of being bit, then I would have the dog put to sleep. If you were to take him to an animal shelter they would ask why you are turning him in, once you say he has bit your children they will put him to sleep. At least if you do it, it will be done with love and with people who care for him.

But I would try a behaviorist first, and in the mean time muzzle him. Your children of course come first. He may not be able to be fixed so you have to be able to face that as well and be ready to do what is best.

I have been in your shoes so I completely understand what you are going through.

Something set him off, maybe a memory, or maybe he feels connected to you and feels he needs to protect you. Dogs do not see kids as kids, they see them as other dogs that they need to control..

I don't find this behavior surprising at all from a former puppy mill dog. I would consult with a dog behavior counselor immediately. A dog behavior counselor is different than a dog trainer and you should be able to find one with puppy mill dog experience. As for finding him a new home... I don't thing people understand what they are asking of a rescue group when they want them to find a new home for a dog showing aggression. How can you ask someone to adopt a dog into their home who may or may not bite them at any time? It is a liability and irresponsible. If this behavior is not something that you are willing to work on with a professional, put the dog to sleep.

First I want to say that I'm shocked that your rescue group hasn't made any contact. Do you go to any adoption events like at PetCo or possibly some other place? Is he listed on Petfinders? Many dogs get adopted in a few months. One dog of mine took 6 months and my current one I've had for 9 months. Most people in my rescue group are surprised he's taken this long. So it makes me wonder if your rescue group is making much effort.

Second what kind of dog is he? Someone may know about particular problems with that breed and be able to offer specific advice. Are there any "shy" dog classes in your area? Shy usually means fearful and I've heard that they can be extremely helpful. There are also books on fearful dog. Help For Your Fearful Dog by Nicole Wilde is one and The Diary of Lucy Blue by Janice Mitchell is one I've heard recommended. I'm sure you could find others and reviews of the books on Amazon or Alibris.

It's surprising that he's made so much progress and learned tricks and then started showing this behavior.