HurtAndConfused, this is a very tough situation.

I think you should stop going to your husband for support on this issue. He has made it clear he does not see your point of view and is not supportive. So it is no surprise that when you ask him the next time, he is still not supportive. You knew how he felt about the dog and his mother but yet after the trial you again expected support, as if he would do an about face. You are beating your head against a wall everytime you go to him for support and setting yourself up for yet more pain. He is not going to support you on this issue! But still, you do need some support. Can you turn to others for support, such as close friends or a trusted sibling? You need someone to hear you out and validate your concern. A non-judgmental listener can be helpful and healing.

I agree that professional help (a few sessions with a therapist) could be useful to you. You are indeed stuck on this issue and it is so painful. If you choose a family therapist, there is the option later to bring your husband in with you, which could also be helpful. It sounds like there are some divided loyalty issues here. A therapist can help disentangle this mess. I think a big step is getting beyond who's right and who's wrong.

In the meantime, you are doing the right thing to not compromise on safety. You can't force your mother-in-law to get rid of the dog, but stick to your guns about not letting your son and baby go to her house as long as the dog is there. You do not want any more injuries. And I also think it is understandable you don't want your husband's dog in your home with your new baby--what happened with the bite has made you very skittish about having dogs around your children. However, I can see this would lead to resentment from your husband--his dog, which perhaps is very gentle and has never bitten a soul in its life, is being penalized because of your fear. It's a tough call. Could you allow your husband's dog but with some boundaries? Perhaps the dog would be allowed inside the home only when the baby is not there and would stay outside when baby was at home? I would also ask you to look deep inside yourself and see if your forbidding your husband's non-biter dog in your house is because of safety fears or because you are mad at your husband for his lack of support regarding his mom's dog.

Good luck.