How to deal with living with a demon dog?

Well you certainly have more patience than I do. I would never have a dog in my home that I was afraid of or had to worry about it biting me constantly. I would have the dog checked by a vet to make sure there is not a medical issue. If nothing medical was found, I would would start training and correcting the dog. If that didn't work, the dog would have to go. I love dogs but I would not live in fear of one in my household.