Why Does My Dog Eat Rocks, Dirt, Bark or Soil? Understanding Pica in Dogs

Have you ever caught your dog licking rocks, chewing bark, eating dirt, or obsessively digging up and consuming soil?

While many people dismiss it as a quirky habit, these behaviours can sometimes point to a deeper issue. The veterinary term for eating non-food items is pica, and it's surprisingly common in dogs.

From a holistic perspective, pica isn't simply a behaviour problem that needs to be stopped. It's often a clue that your dog's body is trying to communicate something important.

Let's explore why dogs develop pica and what you can do to support them naturally.

What is Pica?

Pica refers to the repeated licking, chewing or eating of non-food items such as:

• Rocks and stones

• Soil and dirt

• Bark, sticks and wood

• Sand

• Paper or cardboard

• Fabric and household objects

While occasional curiosity is normal (especially in puppies), persistent pica deserves investigation because it can lead to dental damage, intestinal irritation, parasites, blockages and other health concerns.

Why Do Dogs Eat Dirt, Rocks and Bark?

1. Nutritional Deficiencies

One of the most commonly discussed reasons for pica is a nutritional imbalance.

When the body lacks certain minerals or nutrients, some dogs instinctively seek them elsewhere. Soil, clay and rocks naturally contain trace minerals, and some dogs appear drawn to them when their nutritional needs aren't being fully met.

This doesn't necessarily mean your dog is eating a poor diet. Sometimes the issue is not what goes into the bowl, but what the body is actually able to absorb.

2. Gut Health and Poor Nutrient Absorption

This is where we often see a connection.

Dogs with digestive issues, chronic gut inflammation, food sensitivities, parasites or an imbalanced microbiome may struggle to properly absorb nutrients from their food.

Even when they're eating a high-quality diet, they can still develop cravings or unusual eating behaviours if the digestive system isn't functioning optimally.

Signs that gut health may be involved include:

• Chronic loose stools

• Sensitive stomachs

• Gas or bloating

• Frequent grass eating

• Food intolerances

• Recurring digestive upsets

• Excessive licking or chewing behaviours

When the gut isn't healthy, the body can start seeking answers in unusual places—including the garden.

3. Instinctive Self-Selection

Animals are incredibly intuitive.

Many holistic practitioners believe that some dogs engage in soil eating or plant chewing as a form of self-selection behaviour. In the wild, animals naturally seek out substances that support digestion, detoxification or mineral balance.

While not every case of dirt eating is beneficial, it's worth recognising that dogs often have instincts we don't fully understand.

The key is determining whether the behaviour is occasional and harmless or becoming compulsive and excessive.

4. Stress, Anxiety and Emotional Imbalance

The gut and brain are closely connected.

Dogs experiencing stress, boredom, anxiety or emotional frustration may develop pica as a coping mechanism.

Common triggers include:

• Separation anxiety

• Lack of enrichment

• Aversive training methods

• Household changes

• Moving house

• New pets or family members

• Chronic stress

Many pet parents notice that rock licking or dirt eating increases during stressful periods.

Interestingly, gut imbalances can also influence mood and behaviour through the gut-brain axis, creating a cycle where digestive health and emotional wellbeing affect each other.

5. Underlying Health Conditions

Sometimes pica can be associated with medical issues such as:

• Parasites

• Anaemia

• Inflammatory bowel disease

• Pancreatic insufficiency

• Liver disease

• Chronic digestive disorders

If your dog's pica is sudden, severe or accompanied by weight loss, vomiting, diarrhoea or lethargy, it's important to work with an integrative veterinarian to rule out underlying medical causes.

A Holistic Approach to Managing Pica

Rather than simply trying to stop the behaviour, focus on understanding why it's happening.

Support Digestive Health First

When we see dogs eating soil, licking rocks or chewing bark, gut health is one of the first places we look.

Supporting digestion can help improve nutrient absorption, restore microbial balance and reduce the body's drive to seek nutrients elsewhere.

Our collection of natural gut health products is designed to support dogs experiencing digestive challenges, sensitive stomachs and microbiome imbalances.

Depending on your dog's needs, this may include:

• Canine-specific probiotics to support beneficial gut bacteria

• Digestive support formulas

• Gut-soothing ingredients for sensitive tummies

• Natural supplements that promote healthy digestion and nutrient uptake

Explore our Gut Health Collection here:
https://aussiepooch.com.au/collections/upset-tummies

Review the Diet

Ask yourself:

• Is my dog's diet species-appropriate?

• Are they receiving sufficient nutrients from fresh whole foods?

• Is there enough diversity to my dogs’ diet?

• Have digestive issues been preventing proper absorption?

• Could their diet benefit from a wider variety of fresh whole foods and naturally occurring micronutrients? 

Sometimes small dietary improvements can make a significant difference.

Increase Mental Enrichment

Many dogs engage in pica when they're under-stimulated.

Try:

• Snuffle mats or grass snuffles

• Food puzzles

• Scent work games

• Enrichment walks

• Natural chews

• Play sessions

A mentally fulfilled dog is far less likely to seek entertainment through eating inappropriate objects.

Rule Out Parasites

Even mild parasite burdens can interfere with digestion and nutrient absorption.

Regular parasite monitoring and appropriate treatment are important, particularly for dogs that frequently consume soil.

Address Emotional Wellbeing

If anxiety appears to be contributing, consider:

• Creating predictable routines

• Increasing or decreasing exercise

• Providing calming enrichment

• Supporting nervous system health naturally

• Seeking guidance from a qualified force-free behaviour professional if needed

When Should You See a Vet?

Seek veterinary advice if your dog:

• Regularly eats rocks or large amounts of dirt

• Shows signs of abdominal discomfort

• Vomits after eating non-food items

• Has diarrhoea or weight loss

• Appears lethargic

• Suddenly develops pica behaviour

Rock consumption in particular can become dangerous due to the risk of intestinal blockages.

Listening to What Your Dog is Telling You

Pica is often a symptom, not the root problem.

Whether your dog is eating dirt, licking rocks, chewing bark or obsessively consuming other non-food items, their behaviour may be pointing toward nutritional imbalances, digestive dysfunction, stress, boredom or an underlying health concern.

By looking beyond the behaviour itself and supporting the whole dog—especially gut health—you can often uncover the real reason behind these unusual cravings and help your dog return to better balance.

Because sometimes the garden isn't the problem.

Emerging veterinary research suggests that pica may not simply be a behavioural issue, but can also be associated with underlying gastrointestinal dysfunction, malabsorption, nutrient imbalances, stress and other health concerns. For this reason, a holistic approach that considers digestive health, nutrition and emotional wellbeing may offer the best opportunity to address the root cause rather than simply managing the behaviour.

References & Further Reading

Perez J, Ford S, Lynch H. Pica as a clinical sign of a chronic enteropathy in dogs and cats. Journal of the American Veterinary Medical Association (2025). This study found that pica may be associated with chronic gastrointestinal disease, supporting the importance of investigating gut health in affected animals.

Merck Veterinary Manual. Malabsorption Syndromes in Small Animals. Discusses how digestive disorders can impair nutrient absorption, potentially contributing to nutritional imbalances despite an adequate diet.

American Kennel Club (AKC). Pica in Dogs: Signs, Symptoms and Treatments. Reviews potential causes of pica including nutritional deficiencies, parasites, medical conditions and behavioural factors.

VCA Animal Hospitals. Why Dogs Eat Grass. Notes that pica-like behaviours may sometimes be associated with nutrient, vitamin or mineral deficiencies, although the underlying causes are often multifactorial.