Switch to Canned Food
Pets who are accustomed to eating only dry food should be fed canned food for 2 days. The moisture content will usually help the dog have an easier bowel movement within 12 hours.
Canned Pumpkin
Some veterinarians recommend feeding a constipated dog canned pumpkin. Most dogs love the taste and will usually eat it readily.
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The water content and high fiber will help the puppy poop. But please don’t use pumpkin pie filling, as it contains sugars and spices — only canned pure pumpkin will do the job.
Milk
Milk, which everyone usually has at home, may serve as a canine laxative. A small bowl will usually relieve constipation within hours.
Gravy
Canned or jarred gravy added to the regular diet may also help your dog relieve his constipation. Don’t overdo it — a few tablespoons should do the trick.