I have a shepherd mix, he is short hair, but we have hair EVERYWHERE! I could knit a medium size sweater daily with the amount of hair I sweep up each day. What is a good brush? Follow up, how do I know if he has an undercoat or not? I tried to go to a local pet store, thinking they would be way more knowledgeable and helpful then the big box pet marts....but even they did not know. I bought a brush that is wire bristles and large, and it helps, but barely. I see these amazing ads on Amazon of these combs that take out large amounts of fur, are they worth it? Just any advice or products that have worked wonders for others would be so appreciated, my arms ache from sweeping!