we had to remove the carpet in our master bedroom after it flooded 4 years ago. It was DISGUSTING all the dog hair under the carpet and stuck to the concrete slab. Ewwww!
The floor remained concrete until just last year when I finally stained it. I love the stained concrete. We have replaced the carpet in another bedroom, too. Our whole kitchen, living, dining room is all spanish tile and it's SO nice with the dogs (sure, we get dog-hair tumbleweeds, but I can handle that).

Carpet and allergies/asthma is bad juju.
I hate carpet. yuck!