Derby is a dog born with underdeveloped front legs!
Running for him was almost impossible, and he often got injuries from scratching the ground with his face.
His mobility was increased by a standard wheelchair, but his interactions with other canines and his speed were constrained.
The no-kill shelter that spared Derby from being put to death and a set of modern 3D printed prosthetic legs gave him the best opportunity to have a normal life and run for the first time in his life.
He is still in the process of learning how to use his new legs, that will be gradually substituted with bigger ones.
With his humans, Derby now runs 2 to 3 miles every day, and as you can see in the video, he appears to be really content with his new legs.