Pets are great for a lot of reasons, and, as some of us will attest, one of those is a failsafe ability to keep our feet warm at night. Some folks keep their pets out of the bedroom entirely—or don't have pets at all—because they are concerned about the negative impact to indoor air quality. (Dogs track in all kinds of stuff from outdoors, plus there's the fur and dander factor.) That got us wondering.
image: Jonathan Bean