How many teeth do dogs have
Adult dogs have 42 teeth, while puppies have 28. This article explains the specific types of teeth, the timeline for shedding, and why breed shape matters.
Adult dogs have 42 teeth, while puppies are born with 28 deciduous teeth that are replaced as they mature. This number remains constant across almost all breeds, regardless of whether the dog is a massive Great Dane or a tiny Chihuahua, though the shape of the jaw housing them varies significantly.
The consistency in tooth count is a result of the dog's evolutionary history as a carnivore. The jaw contains powerful muscles and a specific arrangement of teeth designed for shearing flesh and crushing bone. While the total number is fixed, the physical structure of the skull changes dramatically between breeds, creating different challenges for dental health.
The adult dental formula is fixed
The standard adult dentition consists of 42 teeth distributed across the upper and lower jaws. This includes 12 incisors, 4 canines, 16 premolars, and 10 molars. The upper jaw holds 6 incisors, 2 canines, 8 premolars, and 4 molars, while the lower jaw mirrors this with 6 incisors, 2 canines, 8 premolars, and 6 molars. The total adds up to the 42 teeth that define the species.
Dogs use their carnassial teeth, specifically the upper fourth premolar and the lower first molar, to slice through meat and cut food into manageable chunks. This mechanism is distinct from human molars, which are designed for grinding plant matter. The sharp, blade-like nature of these teeth is a direct adaptation for a diet that historically relied heavily on flesh.
Puppies start with a smaller set
Puppies are born without teeth, but by the time they are a few weeks old, the first set of deciduous teeth begins to erupt. By three to four weeks of age, a puppy will have all 28 baby teeth. This set includes 12 incisors, 4 canines, and 12 premolars. Notably, puppies do not have molars in their baby set.
The transition from baby teeth to adult teeth typically begins around three to four months of age. The process is often uncomfortable for the dog, leading to increased chewing behavior as the roots of the baby teeth dissolve and the permanent teeth push through. By the time a dog is seven months old, the full set of 42 adult teeth should be in place. If a puppy retains baby teeth after this age, it is a condition known as retained deciduous teeth, which can cause crowding and alignment issues.
Breed shape dictates dental health, not tooth count
While the number of teeth is identical, the skull shape determines how those teeth fit and how prone a dog is to dental disease. Dogs fall into three basic skull categories: dolichocephalic (elongated, like sighthounds), mesocephalic (intermediate), and brachycephalic (short and broad, like pugs and mastiffs).
In brachycephalic breeds, the jaw is shortened, which often results in overcrowding. The teeth are packed into a smaller space, leading to misalignment that makes natural cleaning difficult. This anatomical constraint means that while a pug has the same 42 teeth as a greyhound, the pug is at a much higher risk for periodontal disease because plaque accumulates more easily in the tight spaces. Conversely, dolichocephalic breeds often have a longer jaw that allows for better spacing, though they can still suffer from dental issues.
Why the count matters for health
Understanding the specific number and type of teeth helps in identifying missing or broken teeth. A dog missing a permanent tooth is not normal and may indicate a congenital defect or trauma. Similarly, the presence of a double row of teeth, where the baby tooth has not fallen out, is a common issue in small breeds that requires veterinary intervention to prevent infection.
The teeth are not just for eating; they are a primary indicator of overall health. Dogs have roughly forty times more smell-sensitive receptors than humans, but their oral cavity is also a gateway for bacteria that can spread to the heart and kidneys. Regular monitoring of the 42 teeth is essential for catching issues like tartar buildup, gum disease, or fractured canines early, especially in breeds with compromised jaw structures.
When to see a vet
If a dog is older than seven months and still has baby teeth, or if an adult dog is missing a tooth without a history of trauma, a veterinary examination is necessary. Sudden changes in chewing behavior, drooling, or bleeding gums are signs that the dental structure is compromised. Because the jaw is designed for high-force biting, a cracked tooth can expose the pulp, leading to severe pain and infection that requires immediate professional care.