I do take out some (very few) guard hairs when I use it on my Corgi. I also pull out large amouns of undercoat which are now in a bag instead of on my couch, on me, in the car, or on my guests. Since he's not a show dog (at least not conformation - I want to do agility with him when he gets bigger) I don't really care. I'd rather take a few lost guard hairs over that ball of fluff I pull out of him. Those butt feathers are really bad about it.