Why Dogs Chew on Rocks: Causes & Solutions

What Is Pica and How Does It Cause Rock Chewing?

Pica is the urge to eat non-food items like stones, dirt, or other inedible objects. One common form of pica is chewing and eating stones, which can lead to serious health risks such as excessive dental wear and gastric obstruction (Fox, 1963). While the exact cause of pica is not fully known, it may be linked to dietary factors, gastrointestinal irritation, or a natural way to induce vomiting when a dog feels nauseous (Beaver, 1981; McKeown, 1996). In some cases, this behavior may have a compulsive character, especially if it persists despite changes in diet or environment.

Instinct and Exploration: Why Dogs Use Their Mouths

Dogs naturally explore their world with their mouths. Since they are born blind and deaf, the sense of taste and touch in the mouth is the first to develop. This makes chewing a fundamental way for puppies—and even adult dogs—to investigate their surroundings. This instinctual behavior dates back thousands of years when dogs had to chew through bone and marrow to survive. Even today, many dogs retain this deep-rooted desire to chew, which can lead them to gnaw on rocks or other hard objects if not properly redirected.

Boredom, Anxiety, and Behavioral Triggers

Chewing on rocks or other inappropriate items can also be a sign of boredom, anxiety, or pent-up energy. Dogs may resort to chewing when they lack mental or physical stimulation. In some cases, chewing becomes a learned behavior—especially if the dog receives attention (even negative attention) for the act. Puppies may start chewing during teething, as gnawing helps relieve the pain of new teeth coming in. If not corrected early, this behavior can continue into adulthood. Additionally, hormonal changes, such as during a dog’s first heat cycle, have been linked to the onset of destructive habits like rock chewing (as seen in the case of Pebbles, per Loeb).

Health Risks of Rock Chewing

Chewing on rocks poses serious health dangers. It can lead to fractured teeth, cuts to the gums, and even intestinal blockages that may require surgery. In some cases, swallowed rocks or fragments can cause internal damage over time. The risk is especially high if the dog chews on hard or sharp objects that can break off and become lodged in the digestive tract. This is why it's important to monitor and redirect chewing behavior before it leads to medical emergencies.

How to Stop Rock Chewing in Dogs

The best way to stop rock chewing is through prevention and training. First, supervise your dog closely and limit access to dangerous items. Keep rocks, shoes, and other tempting objects out of reach. Provide safe, durable chew toys such as heavy-duty rubber toys, nylon bones, or woven rope toys. When you catch your dog chewing on something inappropriate, calmly replace it with a suitable toy and reward them with a treat when they switch to the correct item. Use a cue like “chew” or “toy” to reinforce the desired behavior. Consistency and timing are key to helping your dog make the right connection.