I spent a lot of money trying different combs and brushes for my terrier/shepherd mix who sheds like no other and I really wish I knew about this tool before spending all that money on useless products that pale in comparison to this one. My dog, Nalia, isn't always a fan of being groomed, but she'll lay down and gladly let me comb her with this tool. It takes me about 5 minutes to just run the comb in even rows down the length of her body and the comb literally picks up the undercoat that would have otherwise ended up on my carpet and all over the apartment. Some times it doesn't pick up all the hairs, maybe a few here and there are just loosened and fall to the floor, but I can easily just ball it up and throw it away so I have no complaints. By the way, Nalia is a medium sized dog, about 36 pounds, and I got the large size. I was afraid it'd be too big to maneuver around her body, but it actually works perfectly.