When Phoebe the basset hound got lost and fell into a cistern, her best friend Tillie stayed with her for almost a week. Tillie never left her side except to go find help, which finally came after someone reported that a dog kept coming up to them, then running back to the ravine. The dogs were found, they reunited with their owner, and he destroyed the cistern with a jackhammer. Source Source 2 Source 3
