Bathroom problems after surgery?

My dog just had surgery on his leg, and I just finally got him to urinate after 14 hours. His urine smelled really bad. He is now drinking, licking ice, and he ate lunch. He still hasn't pooped. He didn't eat anything yesterday. He's on three medications: an NSAID (metacam), pain reliever (tramadol) and an antibiotic (antirobe). He's really sleepy and out of it. Should I be worried that he hasn't pooped yet?