Some people do, some don't.  Over the years I've been happy to see people paying more attention to what exactly they are feeding their pets.  I imagine the pet food recalls a few years ago are a part of that.

I have been described as a "pet food snob".  I don't feed my cats or foster cats/dogs anything with ground corn, meat/bone meal, by-products, animal meal, or the preservatives BHA/BHT.  There are other ingredients that I try to avoid as well, but those are the big 5.

Do you take a close look at what is in your pets food?