Why Do Dogs Eat "Weird" Things? Understanding Pica, From Causes to Care

Has it ever happened to you? Out of nowhere, your dog grabs a sock to chew on, or sneaks off to eat grass or dirt, leaving you gasping, "How could you eat that!" I completely understand how this behavior can be both puzzling and worrying at the same time. In veterinary medicine, we call the habit of regularly eating things with no nutritional value Pica, and behind it hide reasons rooted in behavior, health, and even genetics. Let's unravel the mystery together.

In 1 Minute

• Pica is the regular eating of non-food items such as socks, rocks, dirt, grass, or feces.
• In puppies it usually comes from curiosity and teething discomfort, while in adult dogs it is often linked to stress and boredom.
• Sometimes it is a sign of an underlying illness such as a hormonal disorder, parasites, or a nutritional deficiency.
• Research shows pica can be an expression of pain, such as hip dysplasia.
• Some breeds carry a POMC gene mutation that leaves them feeling "never full."
• It can be managed by pet-proofing the home, adding activity, teaching cues, and health screening when the behavior is severe.

What Is Pica and Why Do Dogs Eat Strange Things

The term Pica refers to the regular eating of items that have no nutritional value, and the causes vary by a dog's life stage and behavior. Let me break it down so it's easy to picture.

1. Age-Related Curiosity (Puppy Curiosity)

For puppies, putting things in their mouth is how they "explore the world" through their senses, much like human babies. It also helps soothe sore gums during teething, and it usually fades on its own as they grow, provided they receive proper training.

2. Stress and Anxiety

Anxious dogs often release stress through compulsive behaviors, and one of them is eating strange things. If your dog also starts panting, pacing restlessly, or licking itself obsessively, that may be a sign your dog is dealing with built-up stress.

3. Boredom

If a dog doesn't get enough exercise or mental stimulation, they will "find their own entertainment." Chewing on socks, rocks, or sticks is a popular boredom-buster for dogs that need environmental enrichment.

Medical Causes to Watch For

If your dog suddenly seems "hungry all the time" (polyphagia) and eats everything in sight, I want you to be alert, because it may stem from these underlying conditions.

• Hormonal disorders: such as diabetes, Cushing's disease, or hyperthyroidism.
• Nutritional deficiency: inflammatory bowel disease (IBD) or intestinal parasites that steal nutrients, leaving your dog deficient and driven to eat dirt or objects to compensate.
• Exocrine pancreatic insufficiency (EPI): a condition where the pancreas doesn't produce enough digestive enzymes, leading to weight loss and intense hunger.
• Medication side effects: certain steroids can strongly stimulate appetite.

This is exactly why I always emphasize that regular preventive health checks and proper parasite prevention are key to ruling these medical causes out.

When "Pain" and "Genetics" Hide Behind the Behavior

Research from the journal Animals shows that pica or compulsive behavior does not always stem from psychological or gastrointestinal problems, but may instead be an "expression of pain" somewhere in the body we would never expect.

Case Study: When Hip Pain Made a Dog "Eat Rocks"

One study described a 5.5-year-old Labrador Retriever with a severe history of eating rocks for over four years, requiring five abdominal surgeries. Despite thorough blood work and gastrointestinal testing, no clear abnormality was found. But on detailed physical examination, the dog showed a stiff hind-limb gait and pain around the hips and lower back, and X-rays confirmed hip dysplasia.

After receiving pain medication to treat the hip pain for just six weeks, the rock-eating behavior visibly decreased and resolved completely within two months, with the dog returning to being cheerful and playful again. This case reflects that the dog ate rocks to "distract itself" from the chronic pain it was facing.

The "Never Full" Gene (POMC Gene Mutation)

A 2016 study found something fascinating in the Labrador Retriever and Flat-coated Retriever breeds: about 25% of these dogs carry a POMC gene mutation that makes them feel "never full" and highly food-motivated. This is why Labradors are famously enthusiastic "sock eaters."

Popular "Weird" Items and How to Prevent It

First, let's look at the most popular "weird" items dogs love to eat.

• Grass: 68% of dogs eat grass regularly, mostly because it "tastes good" (especially tender grass) rather than to induce vomiting as was once believed.
• Feces (coprophagia): though owners find it hard to accept, most dogs do it because they "like the taste" or are imitating their mother as puppies. It becomes dangerous when they eat other animals' feces, which risks parasites.
• Socks: socks carry a strong "owner scent" and a soft, stretchy, toy-like texture that dogs find easy to fall for.

Here are the prevention and management steps I recommend.

1. Keep items out of reach: tidy up the home and store socks and small objects in cabinets.
2. Add activity: make time for walks and use puzzle toys to reduce boredom.
3. Teach cues: train the "drop it" or "leave it" cues using positive reinforcement.
4. Provide complete nutrition: feeding a balanced, nutritionally complete diet reduces the chance your dog eats strange things to make up for missing nutrients.
5. Consult your vet: if this behavior becomes obsessive or severe, get blood work done right away to check for underlying disease.

References

1. Mills DS, et al. Pain and Problem Behavior in Cats and Dogs (Animals, MDPI). mdpi.com
2. Raffan E, et al. A Deletion in the Canine POMC Gene Is Associated with Weight and Appetite in Obesity-Prone Labrador Retriever Dogs. pmc.ncbi.nlm.nih.gov