Aging 4 legged friends

Here is a pic of our dog Sandy. She is 18 yrs old , believe it or not. She is a mixed mutt, buy she looks like a miniature cocker spaniel.She is getting really bad lately with walking and getting around. Sue has been giving her glucosamine now for a while. I believe we will have to put her down very soon. Good news though.....my boy Gunner is only 4yrs old.