Grapes are a great way to distract an opossum
As you can see from this video, an opossum can be engrossed in consuming a grape and not care that is atop a Roomba. We recommend bringing 6 or so room temperature grapes (cold grapes aren’t as aromatic) to an exam with your veterinarian. Make a small puncture in the grape for ease of snagging with a tooth. Dole out the grapes one at a time and your veterinarian can use an anal thermometer, check feet and palpate organs with little or no concern from the opossum being examined… until the grapes run out.