I needed a way to demonstrate flyball passing on a magnetic whiteboard to teach pass calling. So I made myself some running dog magnets that I could stick in different places. They're pretty cute.
The hole is to fit a small rare earth flat magnet of the easily common sort. Superglue in place.
I added a second model this one with holes for 1/2" and 3/8" magnets. Surface gluing any size would work too.
Printed .2mm layers, with only a little infill, they don't need to survive the wars to hold a paper on the fridge.