These dogs' long, shaggy coats need a lot of work--so as you can imagine, Briard grooming is quite a time-consuming process. Briards shed lightly for most of the year (and more heavily when they "blow" their coats during the spring and fall shedding seasons); the problem is, the shed hairs from the undercoat will often become trapped beneath the outer coat, leading to frequent tangles and mats. This means a Briard will need daily brushing to keep its coat from becoming a tangled mess. Briards also need baths every 6-8 weeks, but not any more than that, as too-frequent bathing will rid the coat of its naturally waterproof oils. And Briards don't need haircuts at all--though some owners do have their Briards' coats clipped several times per year to make them lower-maintenance. (Note that if you plan to show your Briard, clipping is not allowed.)
To brush your Briard you'll need both a pin brush and a 2-in-1 comb. Brush a Briard as follows: first wet the coat with water mist from a spray bottle, then starting at the shoulders, brush the coat section by section, moving in the direction of hair growth. Make sure to start each brushstroke at the root, then sweep smoothly outward. If you encounter a tangle or mat--and odds are, you will!--first try working it out with your fingers, then continue working through it with the comb. Brush the legs and chest last, then use the comb to go through the hair on the head, ears, and face.
If you plan to follow the brushing with a bath, make sure to use canine shampoo, as the human kind can irritate the dog's skin. You can bathe your Briard either in a bathtub or an outdoor kiddie pool with a garden hose; first wet the coat, then lather the shampoo well. (And don't forget the legs and belly!) Clean the head, ears and face with a washcloth; rinse the coat completely, towel-dry, then give the coat another quick brush-through to make it look clean and healthy.
While many owners prefer their Briards' coats at full length to give it that "shaggy-dog" charm, you can have your Briard's coat trimmed shorter to make it easier to care for. You can learn to clip the coat yourself, but it's a good idea to visit a professional groomer at least once. The groomer can demonstrate the proper clipping method and provide tips on grooming a Briard in general.