Sledge

With the incoming drop, I think it was a good time to add sledge. The sledge would be an entity like the boat. The sledge would move faster on the ground than a boat, but a bit slower than walking. It can be attached to the pet wolf to boost its speed. So, instead of the wolf sitting on the sledge, they would be attached to the sledge instead. The sledge's downside is the same as the boat. It cannot leverage a block high.

Sitting on the sledge would have the same behaviour as sitting on the pig inside the boat. This would make transportation that involved this behaviour look more aesthetically pleasing, on top of allowing the wolf to drag the sledge mounted by players.