Hunted Kansas my entire life and I've never booted my dogs. There have been a couple of fields where I wished I had, but that's over nearly 30 years of hunting. In my experience cactus and sand burr are more prevalent the further west and, particularly, south you go. There's a few of them all over, especially in wheat stubble, but they are way more common in the drier, sandier southwest part of the state. Not uncommon to have to stop once or twice a day and clear a couple sand burrs out of the dog's paws, but I'll deal with that over boots. I'd think about conditioning your dogs' paws in some way before coming.