Chihuahuas as a breed tend to be burrowers. Not all are of course, but my two have that characteristic in spades. All their beds have snuggle blankets mounded up in them so that they can burrow. Because they're so tiny (3.5 pounds each) it's often hard to tell that they're even IN that mound of blankets somewhere. And when they do poke their little heads out (like they begrudgingly did so I could take this photo) their blanket mounds often look like little igloos ...hence the title of this post.