I recently realized my dog is a year older than I thought because of a Facebook memory. I’ve been angry that he lied about his age all this time.

This sounds like candidate for malicious compliance. Just say 1st Jan, when that doesn’t work 2nd Jan, then 3rd Jan and on and on until you crack it

When the dog dies because it didn’t get its medication, and you are having the tombstone engraved, all the sudden it will come to you.