Obviously I haven't but I gave myself a scare earlier. We'd cleaned Harry's chin so I decided to give him his Profender as well. All well and good until I realised that he wasn't supposed to have it until the end of the month, he should have had Advocate today!
Cue me panicking that I'd poisoned him and DH trying to calm me down. After a phone call to the vet I'm sort of reassured that he's OK but I still keep checking on him.
Lesson learned, check and check again before I give him anything!