Arnie, a Springer Spaniel who has just retired as a blood donor after donating 21 pints of blood to the Pet Blood Bank. See SWNS story SWSCblood. A hero spaniel who has donated 21 pints of blood is retiring - after helping to save the lives of more than 80 other dogs. English springer spaniel Arnie, aged nine, started donating blood to Pet Blood Bank in 2015, but has stopped making contributions after reaching the age limit for donors. Canine lifesavers must be aged between one and eight, over 25kg, fit and healthy, and not been abroad recently. Arnie started donating after owner Rachel McFarlane, 36, read an appeal for more blood donors to help save dogs.