One thing to try is a brush that is shaped like a loop, with teeth on
both sides, the whole thing is metal except for the handle. This thing
removes the loose undercoat like a banshee! You will not believe how
much more hair you will get out with this. You can add a supplement
like petromalt a few times a week (the stuff they either lick off your
hand or like my cats, shove in the mouth).