I would try Canidae Platinum (for older and overweight dogs). It has glucosomine and chondrotin in it. It also has a buying program (but you have to ask) where you buy 12 bags and the 13th is free.
I use Breeder's Choice Active Care (also the same buying program, but, you have to ask) Lamb and Rice (they have a Chicken and Rice as well) that has twice the glucosomine and chondrotin as any other food on the market. It's also lower in calories. It is an all life stage food.
www.canidae.com
www.breederschoice.com
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