Hmmmm... very interesting question you pose. I have heard the Dyson vaccuum is supposed to be really good. Or the Oreck, but I am assuming you are not in the market for a new vaccuum. My vaccuum does great with getting dog hair and cat hair up and I have a lot of it at my house, I love that vaccuum.
I will tell you I had a Hoover before this one and our Hoover did not get up ANY hair hardly at all (I gave it to my brother, he has no pets and shaves his head for baseball, so it was good for him). When I got mine that I have now (which right now I can't remember what kind I have, it is yellow and gray and bagless) I could see the difference immediately in my carpet the first time I used it. It picked up all of the hair my Hoover wouldn't and couldn't get. I will have to say that if you have carpet, it is worth it to buy a really good vaccuum. Not that Hoover does not have good ones, I just had a $70 Hoover and for Christmas my mom bought me a good one for around $200.00 one year. You can definently tell the difference in a good vaccuum and one that just gets you by. I used to have to get on the ground and use my hands to pull the hair into a big ball of fur on the ground and pick it up even after I vaccuumed with my old vaccuum. I love my new one, it works wonders, and you can use it on any type of floor, it has a non-carpet switch too.