Brushing your havanese can be done either daily or a couple times a week depending on whether you let your puppy grow his hair out or give him a puppy cut. Also Depending on how quickly your dog gets dirty is how often you will need to bathe him....between once a week to once a month. The longer you go the better for your puppy and your puppy's coat.
Grooming means more then just brushing and bathing your Havanese. You will need to clip nails, clean eyes, pluck ear hair, etc. Even if you are good at keeping up with all your puppy's grooming needs its always nice to pamper your pooch by bringing him to a professional groomer.
Brush/comb your dogs once a day to avoid mats. Once a day with no knots is easier then once a week with mats.Wash his face daily. Staining shows up on lighter colored haired dogs more noticeably. Simple things like his food, treats, and grass darken his hair over time. By washing his face daily you can lessen the staining effect. It also helps by avoiding foods and treats with colored dies in them (especially the red tinged ones).