Chewing is one of the most natural behaviors dogs have, and it serves a surprisingly wide range of purposes. It cleans teeth, strengthens jaw muscles, soothes teething pain in puppies, provides mental stimulation, and helps dogs process stress. Understanding why your dog chews can help you encourage healthy chewing habits while steering them away from the stuff that causes problems.
It Keeps Teeth Cleaner Than You’d Expect
Regular chewing acts like a toothbrush for dogs. The mechanical scraping action helps break up plaque and tartar buildup on the tooth surface, particularly along the gumline where bacteria tend to accumulate. A crossover study in toy breed dogs found that one dental chew per day reduced tartar buildup by 35%, plaque by 15%, and gingivitis by 20% over the study period. Bad breath also dropped by about 19%, since the sulfur compounds responsible for that smell decreased along with the bacteria producing them.
This doesn’t replace professional dental cleanings, but it does meaningfully slow the buildup between visits. Dogs that never chew on anything textured tend to accumulate plaque faster, which hardens into tartar and eventually leads to gum disease, tooth loss, and infections that can spread to other organs.
Teething Relief for Puppies
Puppies start growing baby teeth when they’re just a few weeks old. Around 12 weeks, those baby teeth begin falling out as permanent teeth push through. This teething period typically lasts until about 6 months of age, and during that window, chewing provides real physical relief. The pressure on swollen gums acts like a natural pain reliever, which is why puppies in this stage will chew on nearly anything they can reach.
Puppies also use their mouths the way toddlers use their hands. Chewing is how they explore textures, test objects, and learn about their environment. Giving teething puppies appropriate outlets, like rubber toys designed for the purpose, channels that drive productively. Freezing a rubber toy before offering it adds a cold-compress effect that further soothes inflamed gums.
Jaw Strength and Physical Development
Chewing is exercise for the jaw. The masseter muscles, the large muscles responsible for closing the jaw, develop and maintain their strength through regular use. Dogs that chew consistently tend to have stronger, more functional jaw muscles than those that eat only soft food and never work anything with their teeth. This is especially relevant for growing dogs whose facial structure is still developing, and for senior dogs at risk of losing muscle mass over time.
Digestion Starts With Chewing
When dogs chew their food rather than gulping it whole, they break it into smaller pieces and dramatically increase the surface area available for digestive enzymes to work on later in the stomach and intestines. This matters more than most owners realize, because dogs lack salivary amylase, the enzyme that begins carbohydrate digestion in humans. Dogs don’t get a head start on breaking down starches in the mouth the way we do, so the mechanical grinding of chewing is their primary contribution to digestion before food hits the stomach. Dogs that bolt their food without chewing tend to experience more digestive issues, including vomiting up poorly broken-down chunks.
Mental Stimulation and Cognitive Health
Chewing isn’t just physical. It engages a dog’s brain in a way that sitting idle doesn’t. The act of working on a chew, figuring out how to hold it, which angle to approach it from, and how much pressure to apply, qualifies as a form of cognitive enrichment. For senior dogs, this kind of stimulation is particularly valuable.
A longitudinal study on aging in dogs found that animals receiving behavioral enrichment, which included new toys and cognitive challenges, maintained their learning abilities over time and showed fewer signs of cognitive decline. Dogs without enrichment showed progressive deterioration in their ability to learn and solve problems. The enriched dogs also preserved more neurons in the hippocampus, the brain region critical for memory and learning. While chewing alone wasn’t isolated as a variable, it falls squarely within the category of enrichment activities that produced these protective effects.
Stress, Boredom, and Emotional Regulation
Not all chewing is created equal, and the context tells you a lot about what’s driving it. A large survey-based study on chewing behavior found that dogs chewing on household objects (shoes, furniture, pillows) were not doing it because they wanted to play or lacked activities. Instead, destructive chewing correlated strongly with situations likely to cause negative emotional states: being left alone and disruptions to routine. The correlation between chewing on objects and being left alone was notably strong.
Healthy, enrichment-based chewing looks different. Dogs whose owners regularly provided appropriate chew materials also tended to be more playful, more engaged during human-dog interactions, and calmer during quiet time like petting. In other words, giving your dog something appropriate to chew on doesn’t just prevent destruction. It appears to contribute to a calmer overall emotional state. If your dog destroys things only when you leave, that’s likely separation anxiety or distress, not a chewing “problem.” Addressing the underlying anxiety is more effective than simply taking objects away.
Choosing Safe Chews
The benefits of chewing disappear quickly if a chew cracks a tooth or causes a blockage. Bones, antlers, cow hooves, hard plastic chews, and even ice cubes are common culprits for dental fractures. When a dog bites down on something harder than tooth enamel, the tooth can split vertically in what’s called a slab fracture. These fractures expose the nerve, cause significant pain, and typically require extraction under anesthesia.
The American Animal Hospital Association recommends a simple test: press your thumbnail into the surface of any chew you’re considering. If you can’t leave an indentation, it’s too hard. This “thumbnail test” rules out most natural bones, antlers, and hard nylon products. What passes the test includes most rubber chew toys, certain dental chews designed to flex, and softer bully sticks.
Size matters too. Any chew should be large enough that your dog can’t swallow it whole or break off chunks big enough to lodge in the throat or intestines. Supervise new chews until you know how your dog handles them, and replace any chew once it’s been worn down small enough to swallow.