Nigredo is hilarious. He's a good man. He runs down Malone herding style and chases him back to the house. He does love Malone and won't allow anything to happen to him. He is nearly 7 years old and quite a large dog with MILD weight issues who had mild hip issues when I got him as a puppy... But he has no mobility problems yet. He can jump and run totally fine. He doesn't have a lot of "wind" (tires fairly easily) but he doesn't limp or move stiffly ever. In the mornings, he pops up and flies down the stairs to potty.