Have you tried cheese? My Golden has allergies and has been on antibiotics frequently for staph infections. Prior to his restricted diet, I would wrap his antibiotic pills in cheese--he was quite particular though, and would stick up his nose at "cheap" cream cheese or american cheese, he preferred the stinky imported cheeses! Now that he's on a restricted diet, I just wrap them in his wet food (Wyson Rabbit) and he chows. The other thing that worked pretty well in his pickier days was liverwurst. You might just need to up the ante in terms of the treat.

Good luck.

Jake's mom