Like any companion or roommate, dogs — for all their love and cuteness—have habits we just don’t understand. One question dog owners often ask their pets: “Why? Why would you eat poop?”

When we polled* dog owners recently, most thought it was because a dog is lacking nutrients (49%), they’re anxious (43%) or they just think it tastes good (40%).
Dogs are significantly more likely to eat the droppings of another species (e.g., horses, rabbits) than their own.
We held our noses and got to the bottom of the issue with the help of some experts.
While those in our poll thought this was the number-one reason for the behavior, it has actually never been proven. “It’s a myth dogs eat poop because they’re seeking nutrients they aren’t getting. There’s no evidence to back this,” says
Opens a new windowDr. Jo Gale, BVetMed CertLAS MRCVS, Senior Manager, Global Science Advocacy at Waltham Petcare Science Institute.

According to
Opens a new windowDr. Tammie King, Applied Behavior Technical Leader at Waltham Petcare Science Institute, “It can occur where there is lack of environmental enrichment. You see this often in dogs who are kenneled and have a lack of opportunity to exhibit normal canine behavior.” So if you need another excuse to get out and play with your pooch, this is a good one.
Believe it or not, this is the main reason dogs eat poop. Dr. Jo Gale explains: “Dogs are scavengers by nature and use any opportunity to eat what they can, when they can. They consider it a ‘tasty snack.’” Dr. Tammie King adds that “[Dogs eating poop] is a learned behavior. They’ve done it, enjoyed it, and that behavior is repeated.”
We love our dogs so much that we’re willing to trust our best friends on this. Maybe we should come out with a line of doggie breath mints though. Hmm.

“Ingesting feces from any animal increases potential for ingesting parasites and pathogens,” cautions Opens a new windowDr. James Serpell BSc, Phd Professor of Humane Ethics & Animal Welfare at University of Pennsylvania School of Veterinary Medicine. He went on to say, “[It’s] not something humans should ignore, but it's not worth getting too excited about it.”
All the experts we consulted said that if your dog occasionally eats poop, it’s nothing to be overly alarmed by. Just keep an eye on the frequency and their overall health. And as always, make sure they’re getting a nutritious diet and plenty of exercise and attention. If you have any concerns contact your vet.
Despite dogs liking the taste of poop, we’re going to stick with the healthy range of more traditional flavors offered in all IAMS dog foods.
*Surveyed U.S. dog owners, age 18+
Sample Size: n=201
Fielded May 8 to May 10, 2020
IAMS research has shown that some dog-food products are best formulated using a combination of carbohydrate sources. All IAMS dog foods are formulated precisely to meet the nutritional needs of your dog in his life stage. Such a combination offers optimal digestibility and helps maintain energy levels.
Our dog foods contain a variety of carbohydrate ingredients:
Barley: IAMS uses ground whole-grain barley that's cooked at high temperatures and finely ground in our dry dog-food formulas as part of our patented carbohydrate blend.
Corn: IAMS uses high-quality corn kernels that have been finely ground to break up the outside covering of each kernel, and then cooked at high temperatures to increase digestibility.
Grain sorghum: Also called milo, it is cracked, finely ground, and cooked before it is added to our dry dog foods. It is another carbohydrate source in our patented carbohydrate blend.
Rice flour: Our foods contain small kernels of white rice that have been separated from the larger kernels of milled rice, ground, and cooked at high temperatures to optimize digestibility.
Wheat: This is another high-quality carbohydrate source. In our biscuits, the wheat is an excellent, palatable carbohydrate source and adds a firm texture to the biscuit during the baking process.
Highly digestible diets are an important factor in the well-being of your dog. They deliver more essential nutrients more efficiently, so there is less waste.
Innovative and patented research by IAMS scientists has found that when the complex-carbohydrate sources grain sorghum and barley are used in a dog's diet, their breakdown is enhanced at another level.
These carbohydrate sources are all highly digestible, meaning your dog's body will still metabolize a high percentage of each for energy. What's unique about these grains is that they break down slowly and evenly, providing a stable source of energy.
The slow, even breakdown of grain sorghum, corn, and barley results in moderate, stable blood glucose levels after a meal. By minimizing swings in blood glucose, diets containing such a blend supply sustained energy. IAMS holds a patent on using grain sorghum and barley in a blend for dogs.