Dealing with a demanding dog, especially a large breed, can be challenging on a day to day basis. But when it comes to the weekly grooming session, it can make the whole process a nightmare. Consider this, every time you start to brush "Tiny", he turns his head and nudges your hand, insisting you pay attention to him. How on earth are you supposed to groom Tiny if he won't leave you alone? Getting him to stop this behavior can be particularly difficult since it is a learned behavior in the first place.
No dog is born demanding, but the more you respond to actions like using his nose to push your hand off the keyboard while you are working, constantly pressing against your leg, whining and barking, the more the behavior is encouraged. Tiny will do anything to get your attention, that's what will make him happy.
Working with a demanding dog can be particularly challenging. The sooner you start working to control this behavior, the easier it will be for Tiny to figure out it is not acceptable. Once he understands this, the rest of his grooming sessions will go smoothly. Use this time to bond with Tiny and make the whole process as enjoyable as possible.