I have a 100 lb Lab that sheds like crazy and although my GF loves the dog, she doesn't the hair that builds up in my house, week to week. The local Petsmart offers a Furminator grooming service - I'm curious how long this helps eliminate shedding? Also, if I buy my own Furminator, how often should I brush out my dog with the tool to keep lots of fur out of the house?