I didn't know dogs did this Did you?
A dog in Maryland is believed to have donated the most blood by a dog in the US.
Riley started donating blood when he was one and has been giving blood every six weeks since… he is now eight.
It’s estimated that Riley saved the lives of 224 other dogs with all the blood he’s donated.
His owner says Riley has about only a year left of donating because once dogs hit nine they can no longer give blood.