Dogs with three legs — also known as tripods — can live fit and active lives despite missing a limb. A growing number of three-legged dogs are even training and competing in a variety of sports alongside their owners. Some dogs are born without a fourth leg, while others lose a leg because of injury or illness.

Regardless of why they only have three legs or what leg is missing, many of these dogs are driven and fit enough to participate in dog sports and are increasingly allowed to do so.