Every pet (and family)'s journey is a personal one and there isn't a set time frame or even set steps for the progression of end of life care. So much of caring for an older pet is based around evaluating their quality of life, looking for more: see this article for some good, basic reference tips.
Including: Pet hospice is not a place, but a personal choice and philosophy based on the principle that death is a part of life and can be dignified. The goal of pet hospice is not to cure your pet’s illness but rather to ensure a peaceful end-of-life experience.