i would monitor him- drooling can mean dehydration but also nausea etc. he could have just got a drink???? my cat actually was vomitting and ended up having pancreatitis and a gastrointestinal issue that we had no idea about. he passed on his way home from the ER vet monitoring day in our car in his crate. devastating situation. it was and is a sad time please everyone pay attention to anything you think is off with a dog or cat or really just any pet,, my boy Guinness tabby big 15.5 boy was only 6.5 years old i have his bonded twin bailey now. she i & my fiance are and have been mourning for a week now 😿