I rowed Morty from Fells Point to Under Armor on the other side of the harbor for his morning walk. When we arrived at the other side, I proceeded to tie up Tooth.
The cleat was massive! I use 1/2" three strand for Tooth's docklines because I usually tie them to the cleats on Wisdom (a Morgan 45). Smaller line would get lost on the large cleats of the Morgan, just like they got lost on this cleat.
If you come across this situation, tie a bowline either through the cleat or around the base of the horns.