Canned pumpkin. Depending on her size give any where from a couple of tbsp for a yorkie to a cup or so for a lab. It's a natural laxative. If she doesn't go for longer then a couple of days take her to the vet. And it's straight pumpkin not pumpkin pie filling.
You can help your dog poop by giving her psyllium husks or flaxseeds that are high in fiber to make their stool a bit softer. You should also consult your dog's vet before administering any remedies to avoid an interaction with the other drugs.