Cosequin DS by Nutramax Laboratories, Inc. Cosequin DS supplements are used to treat various joint conditions including arthritis. These supplements have been shown to improve joint health and some refer to them as "joint lubricants". Available in Double Strength (DS) capsules, tasty chewable tablets, Regular Strength capsules and soft chews for dogs.This double strength formulation is intended for larger dogs 25 lbs and over.