[vetvetdoug]

There are no contraindications to the feeding of G/CS. Its only money and no harm in doing so. The only side effect is the loss of money buying the stuff....If your dogs don't like it you can take it too...

[gcruse]

 
Glucosamine and Chondroitin sulfate used in a normal
dog will postpone the effects of arthritis in both humans and dogs

Hmm.  And just how does that work?  ;)

As for contraindications, too high a maintanence
level will make for a stiff neck, pain when rotating
the head to the far left and the far right, and
stiff, painful shoulders.  I assume if the dosage
is kept up the pain/stiff joints will eventually
spread to the whole body.