After you have had him groomed, in whatever form that takes, start by laying a wide-toothed comb upside down on his back, and using it to 'pet' his. Slowly over time you can roll the comb to the teeth to pet him again, this time gradually 'combing' him with the teeth. You won't do much real combing the first couple days, but by the time his fur starts to get long again, he will be used to being combed. You can the gradually work up to a 'people brush'. My long hair, Bruno, thinks his brush is a treat. (except on his tummy, he's too ticklish there.)