The short answer: eating a little dirt on walks is common, and for many dogs it is curiosity or scavenging rather than a sign of illness. Dogs explore the world with their nose and mouth, and soil carries strong smells from other animals, food, and roots. On its own, the odd mouthful is rarely an emergency.
It is worth a closer look when the habit starts suddenly, when your dog eats dirt often or in large amounts, or when it comes with other changes like tiredness, an upset stomach, or a bigger appetite. Those patterns can point to a health cause rather than a simple habit.
The everyday reasons
Scavenging and smell. Soil holds the scent of other animals, dropped food, and decaying matter. A dog that catches an interesting smell may taste the ground to investigate. This is the most common reason.
Curiosity, especially in puppies. Young dogs mouth and taste almost everything as they learn. Many grow out of it with steady training.
Boredom or under-stimulation. A dog that is not getting enough to sniff, do, and think about may eat dirt to fill the gap. A richer, sniffier walk often reduces the urge.
Taste and texture. Some dogs simply like the feel or flavour of certain soil, particularly damp earth after rain.
When it points to something more
If the habit is new, frequent, or intense, a few causes are worth knowing:
- A diet that is not meeting their needs. A dog missing minerals, or not absorbing them well, may seek them elsewhere. A vet can check whether the food fits the dog.
- Anaemia or nutrient gaps. A shortage of iron or other nutrients can drive dogs to eat non-food items. This is a pattern called pica — eating things that are not food.
- An upset stomach. Some dogs eat soil when they feel nauseous or bloated, in the same way they may eat grass.
- Digestive conditions. Problems that stop a dog absorbing food properly can leave it hungry and scavenging.
None of these can be diagnosed at home. A sudden or heavy habit is the signal to book a vet check rather than wait it out.
The health risks to know
Eating dirt is not always harmless. Soil can carry parasites such as roundworms, hookworms, whipworms, and giardia, so keep your dog’s worming up to date. Large amounts of soil or grit can also upset the stomach or, rarely, cause a blockage. And dirt in treated areas may hold fertiliser, pesticide, or other chemicals. If your dog eats soil from a sprayed or fertilised spot, or swallows a large amount, call your vet.
What you can do
Start with management, because it works while training catches up.
- Watch the ground. Scan ahead and steer around freshly dug soil, molehills, and flower beds before your dog reaches them.
- Teach a solid “leave it” and “come.” Reward heavily when your dog turns away from the ground. These two cues do most of the real work.
- Stay calm. Chasing and shouting can turn dirt-grabbing into an exciting game. Redirect to a treat instead.
- Make the walk richer. Let your dog sniff and explore. A dog that is mentally busy scavenges less. Some dogs who eat dirt are also the ones who eat grass on walks — both are scavenging habits, handled the same calm way.
- Check the diet with your vet. If the habit is frequent, ask whether the food is meeting your dog’s needs.
When to call the vet
- The habit starts suddenly, or your dog eats dirt often or in large amounts.
- It comes with vomiting, diarrhoea, tiredness, weight loss, or a bigger appetite.
- Your dog seems unwell, low, or off its food in other ways.
- Your dog ate soil from a fertilised, sprayed, or otherwise treated area.
Matching the walk to the dog
A walk with enough sniffing and exploring gives a scavenging dog a better outlet than mouthing the ground. The walk-length calculator helps set a baseline that fits your dog’s age, breed, and fitness.
Scent-driven breeds notice the ground more than most. Beagles, bred to follow their nose, often need extra “leave it” practice and a well-matched, sniffy walk to take the edge off.
For the research behind our health and exercise advice, see our sources.