When trying to brush you medium to long haired dog to remove loose hair, try using a flea comb. They are great. They are inexpensive and work as well if not better than most "As Seen On TV" pet grooming tools.
My Australian Cattle dog has a thick under coat that needs regular brushing to control shedding. The fine teeth on the flea comb really get underneath and remove that dead layer of hair. I have tried every thing from the Shed Ender to an equine shedding rake. I'll take the flea comb any day.
Related: 
Grooming Your Dog
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