224. A Riddle That Sometimes Needs Repair🤔

RIDDLE 224:

I’m attached to a horse, and even a box; I’m this kind of horn and even a shop; I’m a skilled maker, and I can flip-flop. I’m a four-letter word to help you take walks; what am I?

Look for subtle clues in the background photo, title, and tags (tags are below).

ANSWER IS HERE ON PAGE 2