Common hip and joint problems can really slow your pet down. Many dogs and cats begin showing the signs of arthritis around 7 years of age, sometimes sooner. Adding specially formulated joint health care supplements to the diet can help ease the pain and swelling associated with joint inflammation. Adding specially formulated joint health care supplements to the diet early in life can help ease the pain and swelling associated with joint inflammation. These supplements can prevent some of the changes your pet experiences as it ages.