My parents have the cat one for their cats and every time my pups come over to visit my sister will brush them down with it. It is amazing how much hair it gets out, though I must say I do get similar results with my two with an undercoat rake.

Though maybe its just me but it seems like this year my two pups are shedding A LOT more than they normally do!!! Could be the change in food though since apparently Canidae changed its formula and I had no idea until recently... hmmm...