However, we did the shaving in stages, allowing our dog to get used to the noise (low noise), and treating him each time he had a shave. He loves to be pampered, and feels much better without some dirty, matted coat.
There are 4 limiting combs supplied numbered as: 3,6,9, and 12, which are 3mm, 6mm, 9mm, and 12mm.
We started with no.9, but it was too long, so we changed it to no.6. Depending on your pet, I would suggest taking it easy and trying various combs on a small fur area.