When I was about 10 or 11 I was out riding my pony and my little poodle mix was running along with me. SHe ran into a patch of those and was just in agony. you couldn't pick her up, she had to have a hundred of them caught in her hair, under her belly, everywhere. So i went across the street to a farm house and knocked but no one was home. I turned the door knob and it wasn't locked so I went in and found a pair of scissors. I cut all of them out leaving a pile of hairy burs in the ditch, returned the scissors and left a note apologizing for coming in, i just dind't know what else to do.
Those are EVIL. All of my dogs have short hair that burs do not stick to. If they did have coats I would have to keep them shaved because running in the woods is something we do almost every day.