Penny is a rough-coated Aussie and very fluffy, and has a good bit of undercoat even tho' it's summer. She looks like an enormous Pomeranian.
She ran thru some burdock and is covered in burrs. I've been teasing them out, or in some cases crumbling them with my thumbnails so I can get the pieces out. But there are a few that are stuck tight very close to her skin on her belly and "arm pits". Is there any trick to getting those? They are too tight to cut them out. Maybe give her a bath and try to remove them while they are wet?
I've also heard of using coconut oil to soften them and turn the hair loose (I'd probably use rendered turkey and chicken fat; it melts at about the same temperature as coconut oil, and I have almost a pound of it) But the video I watched where they used coconut oil; the burrs were really not in there all that bad and they probably could have been teased out without it.
I think she's been chewing some of them out, but not the really bad ones.