Have Cat Questions? Ask a Cat Vet Online.
Hello Rita, I'm Dr. Deb and will do my best to help you today.
I'm sorry for this concern about your cat.
I wouldn't expect his encounter with a plastic garbage pail to cause significant damage but it's possible that he might have snagged a tooth or part of his mouth on it which might account for his salivating.
I suspect he's hiding secondary to the trauma which might have scared him.
Since you already have an appointment with your vet this morning, I'd leave him in isolated since he feels most comfortable wherever he happens to be at the moment. I wouldn't force him to interact with you since this may cause more stress.
It's possible that the garbage pail doesn't have anything to do with his current behavior; he could be running a fever, for example, or he might have pancreatitis or possibly an abscessed tooth. Hopefully, a thorough physical exam by your vet will help to rule in or out potential issues of this sort or they may recommend blood work given his age.
I hope this helps. Deb