The ceiling is fine, but my two Whippets have conveyed immediately the interior to the exterior. Was probably too tempting. Although since the mat can not for, you hats the rascals but also made easy. The underside is covered with very thin plastic and does not set the slightest resistance to the chew. Therefore, 3 points, I would not buy anymore. In dogs, the absolutely never gnaw thing, it might work. Overall, not fish nor fowl. For a permanent resting place too little padded, rather for the trunk or the like.