Leash Wall Hook

This hook has a big prong for the handle and a small prong for the clasp as shown in the picture. I mounted it on the wall using a 3m strip. 

I suggest printing the model in its current orientation (sideways with the big hook on the print bed) and with support material for the second hook. Printing it on its back would result in weak prongs that are much more likely to break due to layer lines.