You can get 180-day refills (for a dog 50 lbs or more) of each product - three bottles worth - (and there's always a little more) with this combo at a rad price.
Glucosamine - 180 days
Chondroitin - 180 days
MSM - 180 days
Dose: One-half teaspoon daily of each for 1500 - 2000 mgs for dogs 50 pounds and over.