My dog is having puppies but they aren't here yet, she is breathing heavy but she is eating and drinking lots of water - is she okay or should I take her in to the vet?

It shows she's almost ready to deliver. Think about carrying around a bunch of babies in your tummy that hangs down. That's heavy and a lot of work, sure she's going to be breathing differently from exertion. She's working ten times harder to walk. It's a good thing that she's eating and drinking a lot too! She's eating and drinking for several puppies and herself. If she were to stop eating and drinking, that would be a problem.

If you're still concerned, call the vet and ask