Your dog finishes in the yard, turns around, and eats what they just left. It is unpleasant, but embarrassment won't help you work out why it happens. Some dogs do this as a learned scavenging habit, sometimes diet, digestive problems, or other health issues contribute.
Book a veterinary check if the behavior is new, frequent, or paired with weight loss, diarrhea, unusual hunger, or a change in energy. Your vet may ask about diet, stool consistency, parasite prevention, and other symptoms. Don't add supplements or change your dog's food based on a guess.
Remove the opportunity
For now, accompany your dog into the yard on lead or stay close enough to pick up promptly. As they finish, cheerfully invite them away, offer a reward, then clean the stool. If they are already eating it, avoid a chase or a struggle at the mouth, plan to be there sooner next time. Keep cat litter and other animals' droppings inaccessible too, if those are the target.
Practice an easy "come" or "this way" cue away from the yard first. Reward it well. Then ask when your dog finishes, before they turn back toward the stool. The aim is a new sequence: finish, come to you, collect a good reward, walk on. Don't rub their nose in it or scold them for an accident. That can make toilet time more stressful without addressing the cause.
If another animal's stool is accessible on walks, use a secure lead, scan the route, and steer around it. Your vet can advise on health risks and whether further testing is needed after ingestion, especially if the stool may contain medication or parasites. A clean yard and a reliable routine may be more useful than a product that promises to make stool taste worse.
Sources: VCA Animal Hospitals: Dog Behavior Problems - Coprophagia. American Kennel Club: Why Does My Dog Eat Poop?.