Suggestions: Metal Edging protection/covers for dogs

I have a bunch of metal edging in my backyard (some protruding a bit, other more flush with the ground). I believe one of my dog cut his feet on it while squirrel-chasing, so I'm looking into covering the sharp metal top.

I've googled a bit, but pretty much only came up with this: http://www.amazon.com/Guard-n-Edge-Protective-Cover-Metal-Edging/dp/B004MLVJSK but at $22/30ft I thought I might ask here for any ideas. I don't know how much I have foot-wise, but I'd guess like 200ft?ish.

I've tried getting some plastic tubing and cutting it down the middle to cover it, but it's a pretty laborious process and doesn't hold on very well.

Edit: I might give something like this a try: http://www.amazon.com/Vinyl-Trim-Col-melt-Steel-Edging/dp/B001VJO28K