Not only can humans donate their blood, but cats can too. In the UK, Soot, the cat, underwent a blood tranfusion to save the life of a fellow cat. Soot, a rescue cat, was one of the cats that matched the blood type of a cat that was anemic and needed blood. Soot went through a 24 hour transfusion process to donate blood and both cats are doing well. What a good Samaritan you are, Soot. So if a cat can donate blood, then any one of us can too.