Don't know if this is a glitch or not but my bold and old king has had his hunting dog for 64 years now, well smashing the record for oldest dog. He also had a 30+ year old cat that died.
Makes me think of Reigns...I guess you can teach an old dog a new trick, after all. Like how to survive and outlast mankind, no doubt with the assistance of a dark patron.
There is a Voice of Satan event. Perhaps this is the Hound of Satan. Watch your back.