From the web site you provided: The Missing Link food supplement gives your pets the essential nutrients that are missing from commercial pet foods

Why not just feed a better quality food intead of dealing with supplements? Because commercial foods are not only lacking in certin nutrients, but also contain chenicals and things which may actually CAUSE health problems.

Also, for dogs with arthritis, I though thtis link from the arhtritis foundaiton web site may be of interest:

http://arthritis.org/resources/dogs/...thritis_p1.asp