I dog/house sat for a three legged German Shepherd years ago. He had to take medicine every day, due to the accident when he lost his leg. The way he was pilled was I'd hold open his mouth with one hand and with the other I'd stuff the pill (basically) down his throat right at the side of his mouth. It took me a while to learn the best technique. By the time I was done (three weeks) I had it down. Of course, this dog was used to getting meds.
Don't they have pillers? Like plastic things you can use to stick it down his throat? Ugh, that just sounds awful though.
Too bad they couldn't give you liquid form meds.
Good luck and I hope Beezer is feeling better soon!