Why Do Dogs Eat Dirt and Soil? Safety, Risks & What to Do

If you've caught your dog licking the garden bed, digging up potting soil, or munching on clumps of earth from a houseplant, you're not alone. Geophagia — the technical term for eating dirt or soil — is one of the more puzzling behaviors dog owners encounter. A 2023 survey of canine behavior patterns found that an estimated 15-20% of dogs engage in some form of pica (eating non-food items), with dirt and soil among the most commonly consumed substances.

Unlike human foods that can be safely shared in measured portions, dirt is not a snack — it's a symptom. Below, we break down why dogs do it, what the real dangers are, and exactly when you need to pick up the phone and call your veterinarian.

Why Do Dogs Eat Dirt and Soil?

Understanding the root cause is essential before you can address the behavior. Dogs eat dirt for reasons that fall into two broad categories: medical and behavioral.

Medical Causes

• Nutritional deficiencies: Dogs with anemia (low red blood cell count) or mineral deficiencies — particularly iron, zinc, or B vitamins — may instinctively seek out soil. This is well-documented in veterinary literature and mirrors pica behavior seen in other species.
• Gastrointestinal distress: Some dogs eat dirt when they feel nauseous, similar to eating grass. The theory is that soil may temporarily coat an irritated stomach lining, though this is not an effective or safe treatment.
• Parasite infection: Intestinal parasites like hookworms and roundworms can cause nutrient malabsorption, triggering soil-seeking behavior as the dog attempts to replace lost minerals.
• Endocrine disorders: Conditions like Cushing's disease or diabetes can increase appetite and lead to pica, including dirt consumption.

Behavioral Causes

• Boredom or under-stimulation: Dogs left alone in yards for long periods with no enrichment often dig and eat dirt simply because there's nothing else to do.
• Anxiety or compulsive disorder: Repetitive dirt-eating can become a self-soothing behavior, similar to excessive licking or tail-chasing.
• Scent attraction: Soil that contains food scraps, fertilizer, bone meal, or decomposing organic matter can smell irresistible to a dog's 300 million olfactory receptors.
• Learned behavior: Puppies exploring their environment orally may continue the habit into adulthood if it's not redirected early.

Health Risks of Dogs Eating Dirt and Soil

The dangers vary depending on the type and source of soil, how much is consumed, and the size of the dog. Here's what you need to know:

Small dogs (under 20 lb / 9 kg) face a disproportionately higher risk of intestinal blockage from soil consumption. Even a tablespoon of compacted clay-heavy soil can form a mass in a Chihuahua or Yorkshire Terrier's narrow intestinal tract. According to the Merck Veterinary Manual, pica-related gastrointestinal obstructions are a leading cause of emergency surgery in small-breed dogs.

Signs Your Dog Has Eaten Too Much Dirt

A one-time lick of garden soil during a game of fetch is rarely cause for alarm. But repeated ingestion or large amounts consumed at once can produce these symptoms:

• Vomiting — especially if soil or gritty material is visible in vomit
• Diarrhea — may contain soil particles or appear unusually dark
• Constipation or straining — soil can compact and slow intestinal transit
• Abdominal pain or bloating — a hard, distended belly is an emergency
• Lethargy or weakness — may indicate anemia or toxin exposure
• Pale gums — a sign of anemia from parasite infection or internal bleeding
• Loss of appetite — paradoxically, dogs with pica may refuse regular food
• Excessive drooling — can indicate nausea or oral irritation from contaminants

What to Do If Your Dog Eats Dirt: Step-by-Step

1. Remove access immediately. Move your dog away from the soil source. If it's a houseplant, relocate it to an inaccessible area.
2. Identify the soil type. Was it plain topsoil? Potting mix with perlite? Fertilized garden bed? Cocoa mulch? This information is critical for your vet.
3. Check the product label. If the soil came from a bag (potting mix, fertilizer-amended soil), keep the packaging. Your vet or poison control will need the ingredient list.
4. Offer fresh water. This helps flush minor irritants through the digestive system.
5. Monitor for 24-48 hours. Watch for any of the red-flag symptoms listed above. Note any changes in stool consistency, appetite, or energy level.
6. Call your vet if symptoms appear or if the behavior is recurring. Even if no immediate symptoms develop, repeated dirt-eating warrants a veterinary workup to rule out anemia, parasites, or nutritional deficiency.

How to Stop Your Dog From Eating Dirt

Addressing the behavior requires tackling the root cause. Here's a practical framework:

If the Cause Is Medical

Your veterinarian will likely recommend:

• Complete blood count (CBC) and chemistry panel — to check for anemia, iron deficiency, and organ function (typical cost: $150-$300 depending on your region)
• Fecal parasite screening — a flotation test to detect hookworm, roundworm, and whipworm eggs ($35-$65)
• Dietary assessment — your vet may recommend switching to an AAFCO-approved complete and balanced diet if your dog's current food is nutritionally inadequate
• Supplementation — only under veterinary guidance; iron or B-vitamin supplements if a confirmed deficiency exists

If the Cause Is Behavioral

• Increase physical exercise: Most dogs need 30-60 minutes of structured activity daily. High-energy breeds (Border Collies, Australian Shepherds, Vizslas) may need 90+ minutes.
• Add mental enrichment: Puzzle feeders (like the Kong Wobbler or Outward Hound Nina Ottosson puzzles, $15-$35), snuffle mats, and frozen enrichment items redirect oral fixation away from soil.
• Supervise outdoor time: Use a long-line leash (15-30 ft, $15-$25) in the yard until the behavior is extinguished. Interrupt dirt-eating with a calm redirect to a toy or training cue — never punish, as this increases anxiety and can worsen compulsive behaviors.
• Cover exposed soil: Use hardware cloth, decorative rocks larger than your dog's mouth, or pet-safe ground covers in problem areas.
• Consult a certified behaviorist: If the behavior is compulsive (your dog can't be redirected, shows distress when prevented), ask your vet for a referral to a veterinary behaviorist (DACVB) or a certified applied animal behaviorist (CAAB). Sessions typically cost $150-$350.

Related Substances Dogs Should Never Eat

If your dog is drawn to dirt, they may also target these hazardous ground-level substances:

The ASPCA Animal Poison Control lists cocoa mulch and metaldehyde-based slug bait among the top landscaping hazards for dogs each year. If you use any of these products, switch to pet-safe alternatives immediately.

Can a Nutritional Deficiency Make Dogs Eat Dirt?

Yes — and this is one of the most important reasons to get a veterinary workup rather than trying to fix the problem at home.

Iron-deficiency anemia is the most commonly cited nutritional driver of geophagia in dogs. When red blood cell production drops, the body craves iron-rich substances, and soil (particularly red clay) can contain trace iron. However, the iron in soil is not bioavailable to dogs — meaning your dog can't actually absorb it — so the behavior is instinctive but futile.

Common causes of anemia in dogs include:

• Chronic parasite infestation (especially hookworms, which feed on blood in the intestinal wall)
• Immune-mediated hemolytic anemia (IMHA)
• Chronic kidney disease
• Blood loss from tumors or ulcers

Do not attempt to supplement iron without veterinary bloodwork confirming a deficiency. Excess iron supplementation in dogs can cause iron toxicity, leading to vomiting, bloody diarrhea, liver damage, and potentially death. The safe upper limit for iron in canine diets is approximately 250 mg/kg of diet dry matter, per NRC guidelines.

Frequently Asked Questions

Can dogs eat dirt at all, even a tiny amount?

Accidental ingestion of a small amount of clean, untreated soil (a lick here and there during outdoor play) is generally harmless for healthy adult dogs. However, dirt should never be offered as food, and deliberate consumption should always be investigated. Even "clean" potting soil may contain perlite, vermiculite, or slow-release fertilizer pellets that pose obstruction or toxicity risks.

My dog eats potting soil from my houseplants — is that worse than outdoor dirt?

Often, yes. Commercial potting mixes frequently contain added fertilizers, moisture-retaining crystals (sodium polyacrylate), perlite (small white pellets that can cause obstruction in small dogs), and sometimes fungicides. Additionally, some common houseplants are themselves toxic to dogs — pothos, philodendron, dieffenbachia, and sago palm are all listed on the ASPCA's toxic plant database. If your dog is eating potting soil, check whether the plant in the same pot is toxic.

Why does my dog eat dirt but not his food?

This pattern often points to a medical issue rather than pickiness. Nausea, dental pain, or gastrointestinal discomfort can suppress appetite for normal food while triggering pica. Anemic dogs may find the mineral taste of soil more appealing than kibble. Schedule a veterinary exam with bloodwork to rule out underlying disease before assuming this is a behavioral quirk.

Can puppies eat dirt safely?

No. Puppies are at significantly higher risk from dirt consumption for several reasons: their intestinal tracts are narrower (higher obstruction risk), their immune systems are immature (higher susceptibility to parasites), and their small body weight means any toxin is more concentrated. Puppies showing pica behavior should see a veterinarian promptly, as it may also indicate inadequate nutrition from their current diet or early weaning issues.

Will eating dirt give my dog worms?

It can. Soil contaminated with feces from infected dogs can contain hookworm larvae, roundworm eggs, and whipworm eggs. Hookworm larvae can even penetrate the skin (paw pads, belly) without ingestion. Keep your dog on a year-round heartworm/intestinal parasite preventive (such as Interceptor Plus, Sentinel, or NexGard Plus — your vet will determine the appropriate product) and have fecal testing done at least annually, or every 6 months if your dog is a known dirt-eater.

How much does a vet visit for dirt-eating cost?

A typical workup includes an office exam ($60-$120), CBC/chemistry panel ($150-$300), and fecal parasite screen ($35-$65), totaling approximately $245-$485 depending on your region. If imaging (abdominal X-rays) is needed to rule out obstruction, add $200-$400. While this may seem expensive, it's far less than the $3,000-$7,000 cost of emergency surgery for a GI obstruction caused by soil impaction.

This article is for informational purposes only and does not replace professional veterinary advice. If your dog is eating dirt or showing signs of illness, consult your veterinarian for a proper diagnosis and treatment plan.