Gallbladder disease has a favorable prognosis with early detection and treatment. Gallstones, in particular, can be treated quite successfully with surgery if the rest of your dog's health is good. Unfortunately, there are times when the prognosis is not as good. If left untreated, gallbladder disease can be fatal. Gallbladder disease has a favorable prognosis with early detection and treatment. Gallstones, in particular, can be treated quite successfully with surgery if the rest of your dog's health is good. Unfortunately, there are times when the prognosis is not as good. If left untreated, gallbladder disease can be fatal.