Duncan Lou Who, an adorable boxer puppy, was born with a deformed pelvis and rear legs. There was nothing veterinarians could do to correct his bones, so his back legs were amputated when he was just 12 weeks old.

He's now 16-weeks-old, and Duncan Lou Who hasn't let being a double amputee slow him down. He does daily physical therapy and regularly attends hydrotherapy sessions, and though he gets around just fine on two legs, Duncan Lou Who also has a custom wheelchair to aid his mobility.

Related on MNN: Bionic dog' walks on 4 prosthetic paws