I'm happy to announce that Skeletor had little to no reaction to the preventative yesterday! He came home the same day and was barking at cats and chomping on rawhide like nothing had even happened!
Quite a pleasant surprise! My guess is that being anemic and weak last time, he was just more susceptible.
I'm going to call Dr. Chick Monday to schedule Skelly's next visit.
Kiss those heartworms goodbye, tough guy!