Stool eating, also known as coprophagy, is actually quite normal behavior for a puppy. And though you may find it utterly gross, the behavior does have an underlying cause. Moreover, if the cause is not addressed appropriately and in a timely manner, it does have a good chance of becoming a recurring habit.
To begin, do not be immediately alarmed when you see your puppy doing it. Reacting in a way that is alarming to the puppy can do more harm than good, and may even lead to other behavioral problems.
Stool eating typically begins when a puppy is still in the litter. At this stage, it is natural for the mother to eat the stool of her puppies. She does this both to keep the “den” clean and to protect the puppies from predators that might be drawn by the scent. (It doesn’t matter that there are no predators in your home, this is primitive evolutionary behavior -- other animals do the same thing with their young.) The mother does this from the time the puppies are born until they are weaned, and since puppies are in the process of learning how to be dogs, they are naturally going to follow her lead and do what she does.
Of course, the mother stops eating her puppies’ feces around the time that they have begun eating solid food or have weaned from her milk, but the puppy may still continue the behavior until he becomes more mature. It is learned behavior along with natural puppy curiosity that leads them to smell, taste and even eat their own or other dogs’ stool.
To begin discouraging this behavior before the puppy is ready to go to its new home, it is the breeder’s responsibility to always clean up after the puppies -- before they have a chance to eat it. However, this may not have been the practice used for your puppy.
As previously stated, it is not uncommon to find your puppy eat its own or other dogs’ stool. However, dogs who are receiving a well-balanced and nutrient-rich diet should grow out of this behavior naturally by the time they are one year of age. If your puppy continues this behavior past his first year, you will need to consult a veterinarian or behaviorist in order to identify the problem.
Here are several of the reasons that are typically associated with coprophagy:
Your puppy may not be digesting his food properly. This may be because the food is low in digestible nutrients and is coming out basically the same way it went in, or because the puppy has a problem with his digestive system. To the puppy, his stool tastes pretty much like the food he just ate. For the former, switching to a higher quality food can solve this. For the latter (if switching foods has not helped), you will have to have the puppy checked by a veterinarian.
Boredom is another cause for stool eating. If a puppy is left alone for a long time, he may find relief from boredom by playing with his own stool. This also occurs more often during cold weather, because they are fascinated by their frozen stool.
Stress will often drive puppies -- and dogs -- to eat their own stool. This may be stress from being brought into a new home, or from any of a number of reasons. It is because of this that you should not induce further stress in the puppy by punishing him for eating his stool.
Parasites and worms can leach nutrients from the puppy’s system, causing him to be hungrier than normal. He will respond to his hunger by eating whatever is available. On the same note, your puppy may simply not be getting enough to eat during the day. Puppies are growing and need to be fed at least three times a day. If you have any questions regarding how much you should feed your puppy, talk to your veterinarian, or to the breeder bought the puppy from.
If you have already responded several times to this behavior by getting upset, your puppy may continue to do it just for the reaction. Even though the reaction is a negative one, all the puppy knows is that he is getting extra attention from you. Conversely, your puppy may eat his stool to avoid negative attention. If you have been responding angrily to “accidents,” his response may be to effectively “hide” the evidence by eating it.
Finally, some puppies -- and dogs -- will eat their own stool just because they like to do it. There is not always a satisfying explanation for the behavior, and the best you can do is to try to prevent your dog from doing it by distracting him and getting the stool picked up as quickly as possible.