If your dog is in fact blowing coat, get out your rake. If you don't get the undercoat out, it will mat up like crazy. The undercoat is like cotton and tends to stick together, once it turns loose. I am in the process of dematting the new dog we just got. I'm in Florida, and my dogs started blowing coat in January/February this year. Her previous owners NEVER brushed her. I couldn't find the skin on her tail, hips, thighs, sides, neck. It was just a solid mat. Luckily, because it was caused by her undercoat blowing, I am able to pull small sections away from the huge mats and pick/rake it out. Just don't let it go too long.
Kathy