Thanks everyone for all the info.
Gail - I have a kiddie pool in the backyard, so they can't actually go swimming. I have no problem looking into a real pool at the right time to help my dogs. The exercise you described - isn't that too strenuous for Cooper?
Kathy - Thanks for all the info. However, at this time I'm not going to go for a second opinion. I'm comfortable purchasing Cosequin (once i figure out which one) and taking it from there. If indeed any symptoms develop I will get a second opinion.
Ann - I hope my Cooper is a trooper like Wylie.
Theresa - Nutramax only. You can get it on Amazon. I'll have to survey everyone to see if they like the soft chews, tablets, etc.
Amazon.com: cosequin