The breed's name is descriptive of the way the coat should feel: cottony. The Coton De Tulear's coat is notoriously prone to mats and tangles. Failure to groom the coat constantly will result in a dog who is unhappy, unhealthy and messy looking. You don't need a grooming style as if your Coton is to be in a dog show, but it certainly helps.
There are two basic Coton De Tulear haircuts: the puppy cut and the show cut.
The puppy cut allows the dog's eyes to be seen, keeps the "beard" to a minimum and doesn't allow the fragile hair to drag or catch too much debris. This short haircut is best for owners who want to learn how to groom a Coton De Tulear.
The show cut requires a lot of daily grooming. This style lets the hair flow out long and makes the dog appear to float. You can also add a topknot to the head and splay the tail hair to make it look like a small fountain.
If the coat gets matted, heavily tangled, or if it is very hot, you may want to have your Coton De Tulear shaved. The coat should grow back and be as soft as before, but your Coton will look funny. His skin will be extremely fragile and you will need to be very careful.