You are not being silly. I lost Coyote during a dental two years ago. Fine one minute and then he was gone 25 minutes later. No real explanation but I suspect he was under too long and maybe the additional dose of anesthesia was too much. No one to fault except myself for letting his teeth get to the point that he had to have the dental in the first place. I have since had Akons' teeth done but felt like I needed a Valium to tolerate my anxiety.