Canned pumpkin (not pumpkin pie mix) or sweet potatoes are great home remedies for treating constipation, diarrhea, upset stomach, indigestion and vomiting in both cats and dogs. It's also good for hairballs---much more healthy than the oil-based hairball formulas. I always keep a good stock of canned pumpkin or sweet potatoes in the pantry. It has saved me lots of money on vet bills!
Besides being high in fiber, pumpkin and sweet pototes are a low calorie source of valuable vitamins and minerals. The calcium and magnesium are very soothing on an upset stomach and a healthy source of Vitamin E, Magnesium, Phosphorus and Potassium.
Most dogs will eat pumpkin or sweet potatoes without hesitation. Cats---well, it depends upon how finicky they are. Dogs and cats that eat only dry food can often become constipated. The high water content and fiber in pumpkin & sweet potatoes should get things moving. ;-)
Just mix the pumpkin or sweet potatoes with wet or dry food. For a large dog, mix about 1/4 cup with dog food. Small dogs---just a few tablespoons. Cats--- a teaspoon or 2 should do it. I buy organic pumpkin and sweet potatoes from Amazon.com or the baking section in your local grocery store.
Warning: Do not give your pets pumpkin pie mix. Some of the added spices can be toxic to dogs and cats.
Be aware that both diarrhea and constipation that continues for more than 24 hours can be very dangerous. If adding pumpkin to the cat or dog food does not solve the problem, take your pet to the veterinarian ASAP.