When brushing Bailey, I've always used a pin brush, slicker brush and a greyhound comb to line brush. The greyhound comb always did a decent job of removing her undercoat. At agility class last night, my trainer brought an undercoat rake. I decided to try the rake while we were waiting our turn. I couldn't believe the amount of fur that was coming off Bailey...and I just line brushed her the night before! My trainer actually let me keep the rake. It's a metal-toothed, double rowed rake. She works for the company and has a box full. I never knew how important an undercoat rake is for a sheltie when shedding. Poor Bailey. She hates being brushed and now I have another "torture" device.