From Tinykittens.com/FAQ: "Cassidy is probably the most significant individual kitten to have passed through the doors of Tinykittens HQ. His story is a remarkable one, and there are many chapters still to be written. He has the potential to change the world, for kittens, cats, other animals and maybe even humans. Follow Cassidy’s progress here
Cassidy and Topper - In early September 2015, these two feral brothers were trapped at the colony by the property owner, who was concerned to see that Cassidy had no back feet. He was moving around using only his front legs, with his rear end held off the ground like (to quote Shelly) “a reverse velociraptor”. He was struggling to find food, clearly in pain and suffering from infections in both stumps. It is unlikely that he would have survived much longer in the colony had he not been trapped when he was, and in fact it was something of a miracle that he had made it that far. He had obviously been initially protected by his mother and, later, by his brother Topper, who was a normal, healthy and rambunctious kitten and about twice Cassidy’s size.
Update at 25th October: Cassidy continues to go from strength to strength, although the problem of his hyper-extended knees has not been overcome. Many types of splints and bindings have been tried, several of them provided by viewers, and Shelly is trying to encourage him to stand up on his stumps while they are splinted and to get used to using his back legs normally. It will not be possible for him to benefit from prosthetics if he is unable to walk on his back legs."