Vacuuming a rug that a dog sleeps on feels like it works, right up until the light changes and you see what is still in there.

The fur that matters is not sitting on top. It is worked down into the pile, and suction passes straight over it, because a vacuum pulls air and the hair is held by the fibres on either side of it.

This is a rake, not a brush. The edge is stiff enough to reach down into the carpet and drag what is buried back up to the surface, and once it is up there it gathers into a sheet you lift off in one piece. That is the actual difference. A vacuum has to carry the hair away in moving air. This one hands it to you.

The first pass off a rug you thought was clean produces an amount of hair that is genuinely unpleasant to look at. That is the satisfying part, and it is not the review. The review is that this is slower than vacuuming, because it is meant to be used before a vacuum, not instead of one. An extra pass, by hand, so it suits the two or three places the dog actually lies, not a floor plan.

It moves hair. That is all the mechanism does, so dust and dander stay the vacuum's job. And how far it reaches into your own pile is the one thing you cannot know before it arrives, so if your rug is shag, treat this as a maybe. If the problem is your clothes, buy a lint roller. If it is the whole house, spend on the vacuum first.

4.3 across 30,756 ratings tells you a lot of people bought this and most of them were fine with it. It tells you nothing about carpet like yours. On low pile it is the difference between clean and looks clean.