Both the short- and long-haired coat varieties need moderate care, so overall Saint Bernard grooming can take a good bit of time. Both coat variants shed constantly (and a great deal during the spring and fall shedding seasons), and the long-haired types can mat and tangle, so brushing is necessary (for both types) 3-4 times per week. Baths are only needed occasionally, if your Saint Bernard becomes especially dirty or stinky, because bathing can remove the water-resistant oils from the coat. And though most breed owners don't give their Saint Bernards "styled" haircuts, some have their dogs (particularly the long-haired types) clipped shorter, both to make the coat more maintenance-free and to keep the dog cooler in hot weather.
Brushing a short-haired Saint Bernard will require a rubber curry brush, and long-hairs will need both a pin brush and a 2-in-1 comb. Brush your Saint Bernard in the typical line-brushing method (which, given these dogs' massive size, may take a while!); use the comb to work through stubborn mats and tangles on the long-hairs (which usually form on the thighs or behind the ears). During shedding season, many owners say they brush their Saint Bernards daily, and some also use a shedding blade--a curved, toothed brushing tool available at pet stores--on their dogs once a week.
Bathing these huge dogs can present a problem: unless owners have a big walk-in shower, Saint Bernards will need to be bathed outdoors using a garden hose--but if the weather is too cold, indoors is best. Whatever the case, use canine shampoo (and for long-hairs, conditioner too, if desired); lather and rinse well, towel-dry, then give the coat another quick brush-through to make it look clean and neat.
If you choose to shave your long-haired Saint Bernard down (and more info on the process can be found in the Styling & Haircuts section), the dog will need a trim every 2-3 months. It can be done at home with practice, but it's a good idea to visit a professional groomer at least once, as he or she can demonstrate the process and provide tips on how to groom a Saint Bernard in general.