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I went to grooming school well over 10yrs ago and started with a nice pair of Oster clippers. I had difficulty getting through thick coated dogs and switched to the Andis A2 model. The difference was night and day! I still have that original pair of Andis clippers for home use and use the newer model at a local shelter. Some tips- Blades will get hotter on the 2nd/faster setting (they are rubbing back and forth very quickly--they are going to get hot people--no matter what--any blades that move fast enough to slip smoothly through a thick dog's coat will have the same problem). The trick is to have at least 2 sets of blades and cooling spray. Remember to oil your blades and while grooming use the cooling spray--when they get too warm switch them out for the other blade and keep rotating. It's worth the money-it'll save you a lot of time and your dog some grief. Also--clean hair is MUCH easier for clippers to go through. Extra dirt and oils in the hair will slow you down a lot and make the clippers heat up much faster--so bath your dog (scrub down to the skin on those thick coated breeds) and then blow him/her dry or at least let thoroughly air dry. T-h-o-r-o-u-g-h-l-y dry. Hope this helps!