Not easy! It was quite adhered. But I managed to peel it off with only two meows of pain from the patient. Opioids cause constipation, and Penny appears to be constipated. With what, I don't know. She's only had about one tablespoon's worth of food since Saturday. But she gets in her litter box and strains without product. I believe the constipation is causing her appetite to decrease, and she needs to eat so she can heal.
So, I'm going to give her an enema. (After this blog post--don't worry. P.S. I was a veterinary technician in another life. I can do this.)
Hopefully we'll get her unclogged so she will start eating again. I've force-fed her what little food she's had the last few days. Actually, no so much force-fed, as trick fed. I smear a little baby food on the side of her mouth and, being fastidious, she can't help but ingest it while grooming.
Offered here, for your delectation, 20 seconds of feline grooming.