Vet left a couple of hours ago, had to have Chance put down. Found him down in the pasture - Sparky and Ethan were in the front pasture by themselves, which was unusual, the three stuck together like glue, so I went looking. He was in the back pasture and couldn't get up. Vet said his heart was too weak and there was nothing he could do. Ethan and Sparky have been calling for Chance since we brought them in. Such a depressing end to the day. Goodbye, big boy.