With older dogs, the best thing to do is to talk with a veterinarian. Only you and your vet know your dog best and can make an informed decision. Often, there are options to treat some disorders associated with aging. For example, when our dog developed severe neck pain due to disc disease, a combo of a various pain meds that had a synergistic effect helped a whole lot. For joint pain, we found some awesome supplements that worked like a charm. Sometimes, there may be un-diagnosed disorders that may be treatable. There are drugs to reduce leakage in incontinent female dogs and acupuncture sometimes can do wonders for some dogs. When our dog was struggling to get up, we used a blanket under her to help her to help her get up, invested in non-slip mats and used toe-grips.