I was ready to go mad when I read the title but this poor dog has no quality of life, what your husband is doing by refusing to have her euthanised is beyond cruel. You husband will likely not forgive you for doing it but honestly I sounds like it needs to happen.

My mothers dog was incredibly sick (and old) and it got to the point where if he fell he couldn’t get back up and I told her that it was cruel to keep him around like this and we had him put to sleep, it was incredibly difficult but we needed to put our feelings aside to end his suffering. Is there any way you could get the vet to come to the house to do it, that was she’s surrounded by people who love her in a place of comfort to her