My RB dog Tigger had to have Glucosamine as well! She had to have the same amount as Duke! She was a German Shepherd X! We used the glucosamine that are found in jars and they are around $12.00 CAN, we pick them up at the Pharmacy or a drug store like Shoppers Drug Mart! Com'n Duke you can do it, lose that weight, what breed is Duke, because Tigger was around 75 lbs!