He's been sleeping all day, doesnt want to eat and is very weak. Hes very old and blind. How do I know if his time has come?
Before making a decision of putting your dog to sleep, you should go to your veterinarian to perform diagnostic tests and evaluate your dog's health condition.
A professional veterinarian should only perform euthanasia of an animal when there is an incurable disease that is significantly reducing quality of animal's life, never otherwise.
We recommend you to visit your vet who will help you decide.
All the best for Grampa and you!