I purchased this item hoping that my cat would crawl under it to brush him to eliminate some of the shedding in the house.  The problem is that the brush portion of this item is not secured in the platform.  The twisted wire is inserted in a predrilled hole in the platform.  This item would be so much better if it was secured with a screw in the platform.  My cat is large he can pull the brush out of the platform when he walks under it or around it.