The Cane Corso is not a dog for the faint of heart or the first-time dog owner. They are large, powerful dogs that are strong-willed with a domineering personality. While these characteristics make for the perfect family protector, they can leave you with a furry friend who tries to avoid those things he doesn't like, such as grooming, and may become quite agitated if you have already taken the necessary steps to teach them how to be calm.
Your pooch is going to do everything he can to prove he should be the "Alpha" in the pack. He has a natural tendency towards a "take charge" attitude that can make things really tough. But if you start out from day one showing yourself to be the leader of your pack, then keeping him calm during grooming time should be relatively easy.
Consider this: the biggest reasons your Cane Corso gets anxious around grooming time are probably that you are introducing tools he has never seen before and you are insisting on touching virtually every inch of his body. The calmer and more relaxed you are, the more your fuzzy friend is going to pick up on these vibes and remaining calmer himself.