I think it entirely depends on the dog. I do think it's a great tool and does a very good job......but you just can't get some dogs near it! But it works for me on 1 of 2, so for $20 I'd say that's pretty good!
Chase (Friendly Resident Wigglebum) - Border Collie/Lab/Shepherd X
Kailey (Misunderstood Gentle Beauty) - GSD & foster failure #1
Rupert (Gold-Medal Winner of the 3 a.m. Kitty Destruction Olympics
Heidi - RIP my sweet baby girl