Cosequin for Dogs 250 Capsules DS Cosequin DS: supplements are used to support joint health and help fight the pain associated with arthritis. Cosequin DS supplements have been shown to improve joint health and some refer to them as "joint lubricants". This double strength formulation is Cosequin DS is intended for larger dogs 25 lbs and over. Dermaquin:is formulated for skin and coat health source of omega-3 fatty acids derived from salmon and other cold water fish. Omega-3 fatty acids help support the skin and coat plus the following areas: