When old Charlie the horse lost sight in both eyes, his humans thought they would be forced to put him down to spare him suffering. But good ol' Jack the goat stepped up to the plate to protect and lead his pal - for sixteen years. After Charlie lost sight in the first eye, Jack led him from that side, and when the second eye went, Jack led from directly in front so that Charlie could get to and from his favorite grazing spot. Once Jack even saved Charlie from being trapped by a storm, in a very Lassie-esque moment. Sadly Charlie has passed on to that great pasture in the sky, but Jack's friendship allowed him to live to a ripe old age.
5. This lab doesn't mind being the tall friend.