The life jacket for dogs that is ergonomically designed for the buoyancy aid of your swimming canine. With 90% of the flotation in the water under the chest and neck, the underDOG supports the natural swim angle of the dog. Traditional dog vests pull the body into a horizontal position. With the underDOG the rear is allowed to sink lower than the forelegs, freeing the hind legs to swim more efficiently, while the neck is supported so that the head rides higher above the water line. Two body straps, a neck strap, and a chest strap can be adjusted to fit a wide variety of dogs. Two grab handles provide even lift distribution, and are designed to support the full weight of a wet dog. The neck handle doubles as a handy leash attachment point.