Derby was first given a cart, but it would limit his mobility. Anderson and her team then tried to design a smooth curved prosthetic that shaped perfectly to Derby's short forearms."I don't become impressed really quickly, but when I saw him sprinting like that, it was amazing," said Dom Portanova, adoptive parent of Derby. "I couldn't believe it,"
The design team started Derby with low prosthetics so he wouldn't feel a drastic change of height. Slowly, they can adjust the height so it's more fitting for his posture and size.
Derby was born with a congenital deformity that resulted in small forearms and no front paws. He was first given a wheel cart so he could walk, but it limited his mobility to play with other dogs.
"The first time he was put on them and he just took off running, he was so happy," said Sherry Portanova, adoptive parent of Derby. "I was amazed at how well he did."
Anderson and her team had also created a different type of prosthetic that would resemble a pirate's peg leg, but she was afraid that Derby would get it stuck in the dirt when running. Therefore, she thought of the round form, which adjusts better to his movement.