Do you have yogurt that you can share with him?
I give plain yogurt to Krypto, and he's fine with that. (I'm not, and mix jam in mine, lol!) But, he's not taking it for anything like an antibiotic.
Prayers for Aragorn, and for you who worries, and also has to deal with problems that crop up.
Love All Life, Thank You For Posting! :)