What do you want to ask about dogs?i have a 10 yr old Gordon Setter and am feeding him purina one for lg breed?

dogs should i add any supplements ? joint etc he is not having any problems with his hips or getting around he easily jumps on the bed he is a lg dog weighs 100 lbs but is not fat he is 10 and is my 2nd gordon my last one lived to be 16y/old