I know, I can hardly believe it either

A 3 headed dog. Sounds like a tall tail tale to me.

Inspired by a dog walker who passed by my window yesterday. He was leading 3 dogs, or at least I could clearly see 3 heads, but I could only see 2 rear ends and had to do a double take. It was like the optical illusion with the cricket stumps where you see 3 at one end but just 2 at the other. Did my head in I can tell you.