Tech video producer Marques Brownlee tells us about Cleo, a healthy dog who only has three legs. Four-legged animals can get along on three legs, but it puts a long-term strain on the leg that has to support twice the weight on its own, leading to joint pain and bone deterioration in old age. What Cleo needs is some support for her weight. The company 3DPets makes custom-designed prosthetics for pets using 3D scanning and 3D printing. No two dogs are alike, and neither are their amputations, so the scanning, printing, and fitting are crucial. The technique of 3D printing is perfect for this application, because if an animal's prosthetic doesn't fit and work perfectly, you can't explain to them how they should just put up with it. Cleo went through a breaking in period to get used to her new leg, but is coming to trust it and use it. -via Laughing Squid