As a few posters have mentioned, some sort of flat proofing is a great idea. In my area there is a low growing vining plant called referred to as Goat Heads or Puncture Vine. It tends to be incredibly invasive. Anybody who lives in an area where it grows is very familiar with it because they’ll have had many flats on any small inflatable wheels they own. As others have suggested, you could buy specially made liners to try and cut down on flats, but after having repaired dozens and dozens of flats due to Goat Heads I’ve come up with a standard procedure I use for ALL my small inflatable tires. Rather than buying a liner, I use an old innertube made for the size wheel I am working on. Using a pair of scissors, I cut the inner two thirds of the old innertube away, so I am left with a piece that fits around the outer circumference of the new tube. After installing the liner and new tube, I use a product called “Slime”, adding the recommended amount into the new tube. With the combination of the home made liner and the green slime, rarely do I ever get another flat on that wheel. At worst, it may develop a very slow leak requiring a bit of added air every few months. The website for the green slime is www.slime.com BTW, I’ve found that my homemade liners actually tend to work better than the expensive Kevlar ones for some reason.
Great explanation and tip. My repair was using a rubber layer similar to what you suggest, though professionally installed.
These spurs are all over and for my Golden Retriever, particularly uncomfortable ingested.