Idea Exchange: An easy way to keep patients in the dark Dec 01, 2004 By dvm360.com staff VETERINARY MEDICINE Instead of stuffing towels into cage doors to darken the kennel, we fashion a piece of dark fabric, as shown, to hang on the door. We use thicker fabric to pad the door or to trap heat inside. Dr. Dawn Kaiser Park Rapids, Minn. Hot topics on dvm3605 ways to wow pet owners (and pets) 10 steps to take when a practice owner dies dvm360 sits down with Dr. Pol Ack! How do you spell that again? "Best. Veterinary Practice. EVER."