subject: Old Dogs With Arthritis Need Exercise [print this page] Also, don't forget to include a daily dose of glucosamine supplement for your aging canine. This is probably the single most important supplement one can give their older dog who is suffering the effects of canine arthritis. The glucosamine will help the joints stay properly lubricated with a good layer of cartilage. Health cartilage is vital in the joints to keep the bones from rubbing together causing more severe arthritic symptoms.