Checklist: The rule of 20 Feb 06, 2013 By Rebecca Kirby, DVM, DACVIM, DACVECC VETERINARY MEDICINE Click here to download a PDF of this checklist of 20 critical parameters to evaluate at least daily in critically ill animals. Related linksCold critters: Assessing, preventing, and treating hypothermiaHow to get the most out of your radiographs in emergency situationsVideo: Save a life! Perform thoracocentesis when you need to 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."