I just cut 4 layers of canvas, sewed a spiral starting in the middle with a fancy but tough stitch, then added some double fold bias tape on the outside edge. Easy to do, but boring to sit and do the spiral. Even with my machine on its fastest setting it takes about 20 minutes of continuous sewing.
I have gotten the dogs to play frisbee a little bit now, but unlike the ball, they don't want to return it. Watson prefers to run away with it and try to gnaw holes in it. It is holding up pretty well though for getting abused by Watson (aka "Mr. Chomp chomp chewy chomp")
I think the next batch of them is going to be smaller though, and maybe I'll put something else in the edge to make them easier for the dogs to pick up when it is laying flat.
