My DOG, I thought Rufus had the record for an earful of cleaver or goose grass seeds! Twice daily I groom with what I call the rake comb, or sit and take them out by hand. Rufus has a bizarre habit of eating them and the fur stuck to them if I do not put it out of reach. Slicker brush doesn't work well on getting them out of Rufus's coat. I was going to take a photo of his first crop a couple of weeks ago when he came out covered all over, but battery had run out. I think they are worst in Autumn. He is the only dog around covered in them, when he goes exploring of track. They seem to stick really bad and are small and dry. He hates them on his feet or leg feathers.