Have you tried blowing him out with his hair dryer (if he has one)? I know it kinda helps us. Other than that, I'm awaiting any other suggestions too. Bear has now broken 4 vacuums due to hair loss. Grrr....
A couple of suggestions may help. You could look into purchasing a "blower" which is used for grooming purposes. This device blows out cool air at varying speeds, which loosens the heavy under coat of working dogs. It especially works well after a bath; but beware, this is best done outside if possible, otherwise your house could like like it has freshly fallen snow! My Pyr will sit and almost fall asleep when I do this with him because it is so relaxing. My Mal, on the other hand, runs at the sight of the blower and won't get near it.
Second suggestion....
our vacuum cleaner started on fire last weekend, so we broke down and bought the "Dyson" series vacuum cleaner that is specifically made for pet hair. This machine is absolutely unbelievable..
....we have gone through many vacuum cleaners the last 20 years of raising large breed dogs, and this vacuum cleaner by far surpassses any other on the market. I would highly recommend it. Pricey, yes, but I figure if this will last 5 years, I will have paid less than the combined purchase of 3-4 vacuums over that period of time. It is also very lightwieght and is bagless; therefore no more bags to buy for the rest of my life. Good luck!