As a mother of two children with autism, I always had to be on guard in case they hurt an animal, so we did have them and unfortunately, had to rehome them. Even now, with my oldest, who is 26, he had a cat, and I decided it was best for the animal to be rehomed. Unfortunately, social services and the school have a duty of care to step in when there are risks to children. You can seek legal advice, but it is hard to fight the department due to the child protection laws. My advice, in all honesty, is to seek help from a local support group for parents, and to go to your local MP to explain the situation and that you have little support. Have you thought about talking to your local doctor about getting some extra support? Sometimes they can have a little push in the right direction of support services because you, as a family, sure need it. It is not just about rehoming the dog just because it knocks over your little one. Little ones fall all the time. I would also approach the department to which the complaint was made and find out your rights. As far as your oldest daughter, you need support. Once again, talk to your doctor and explain what is happening and what support is out there for you and your daughter. You also need support big time. I hope this helps, and big hugs