Check around to local rescue groups. My sister runs a dog rescue and my aunt runs a cat rescue. Both have helped adopt and/or foster out family pets in situations similar to yours. My sisters dog rescue also helps some dog owners with surgery, medications, shots, and food. Many rescues are overextended but many will go to great lengths to keep an animal from being euthanized. If you can, start calling rescue groups, tell them your situation and the health of the dog and see what they might be able to do. Wishing you well!