My dog caught a cold and he's been on antibiotics for a week. He's almost finished with the pills, but his cough has gotten worse. Is it one of those things that gets worse before it gets better? Or is the medication not working? I've already been back to the vet once since the original visit and didn't get anywhere, so I don't want to go back again and pay 80 bucks to get told to keep doing what I'm doing. It's so heart breaking to see his sweet little body trying to breathe.