I would strongly discourage you doing this. A dog has hair for a reason. it regulates the body temputare they need. a SB has a thick double coat with guard hairs. Much to what you probably think about helping the dog keep cool, it wont work well. Your dog will be more likley to get sun burnt and more bug bites from the coat being shaved. the thick coat actually helps keep them cool in summer and warm in winter. by shaving them you may or may not ruin the coat completly, so by winter the dogs coat may not do its job by keeping it warm enough.