How Many Teeth Do Dogs Have? Puppy vs Adult

Your puppy drops something on the living room carpet and you lean in expecting a toy. It’s a tiny, needle-sharp tooth. Completely normal — but it’s the moment most owners realize they have no idea how many teeth their dog actually has, or how the whole process works.

The answer isn’t one number. How many sets of teeth do dogs have? Two — and they’re pretty far apart. Dogs go through both sets across their lifetime, and understanding each tells you a lot about what to watch for at different life stages.

Here’s what shapes the full picture: - Whether you’re counting puppy teeth or adult teeth — the numbers are completely different - Which types of teeth are in each set, and why puppies are missing one entire category - The timeline of when teeth come in and fall out, which moves faster than most people expect - What retained baby teeth look like and why they matter - How dental health connects to overall health in ways vets talk about a lot more than owners do

How many teeth do dogs have — and when

Dogs have 28 teeth as puppies and 42 teeth as adults. That’s the headline. But the details are what actually help you understand what’s happening in your dog’s mouth at any given point.

1. Puppy teeth: 28 total, starting at 3 weeks — PetMD confirms that deciduous teeth (the technical term for baby teeth, also called milk teeth) begin erupting around 3 to 4 weeks of age. By 6 weeks, most puppies have all 28 in. You won’t see them doing much about it — puppies this young are still with their mother. But by the time they come home with you at 8 weeks, the full set is already there.

2. Adult teeth: 42 total, fully in by 6 to 7 months — this is where the number jumps, and the jump surprises people. The transition from 28 to 42 is because adult dogs gain an entire tooth type that puppies don’t have: molars. Rutherford Veterinary Hospital notes the adult breakdown is 12 incisors, 4 canines, 16 premolars, and 10 molars — 20 teeth on the top jaw, 22 on the bottom.

3. The transition window is 3 to 7 months — puppy teeth start loosening and falling out around 3 to 4 months old, right when permanent teeth are pushing up behind them. The whole process wraps up between 6 and 7 months for most breeds. That’s a tight four-month window where you might find small teeth in your dog’s bed, on the floor, or — yes — occasionally swallowed without incident.

4. Breed size doesn’t change the count — every adult dog, from a 4-pound Chihuahua to a 180-pound Mastiff, ends up with 42 permanent teeth. What varies by breed is how crowded those teeth are. Small breeds often have the same 42 teeth packed into a much smaller jaw, which is part of why small dogs tend to have worse dental disease than large ones.

5. Puppies have no molars at all — this is the cleanest explanation for the 28 vs. 42 gap. Puppies have incisors, canines, and premolars, but zero molars. All 10 molars are adult-only teeth with no deciduous predecessor. They don’t replace anything — they simply grow in where there was nothing before.

Which dog owners most need to know this

Knowing the tooth count isn’t trivia. For specific groups of owners, it’s genuinely practical information.

1. New puppy owners tracking development — if you know your puppy should have all 28 baby teeth by 6 weeks and all 42 adult teeth by 7 months, you have a timeline to work with. Noticing that your 5-month-old still has a baby canine sitting right next to an adult canine isn’t alarming if you know what’s happening — but it’s worth watching.

2. Rescue dog owners estimating age — vets and rescue workers use teeth to estimate a dog’s age when records aren’t available. A full set of white, sharp adult teeth suggests under 1 year. Yellowing and wear points toward 2 to 5 years. Heavy tartar and worn, flattened teeth suggest older. Not exact, but useful.

3. Small breed owners — Dachshunds, Pugs, Shih Tzus, French Bulldogs, and other compact breeds are significantly more prone to dental crowding, retained baby teeth, and early periodontal disease. Knowing the normal tooth count for their breed helps owners catch problems earlier.

4. Senior dog owners — dogs can and do lose adult teeth, usually from advanced gum disease. Knowing what a full set looks like helps you notice when something’s missing and flag it at the next vet visit before an infection takes hold.

5. Anyone whose dog is around 4 to 6 months old — this is the active teething period. Your dog may chew more, drool more, be more irritable, and have slightly sore gums. Understanding the tooth timeline explains the behavior and helps you respond appropriately rather than just trying to stop the chewing.

Types of dog teeth and what each one does

Four types, each built for a different job. Dogs are not just chewing machines — their mouths are specifically designed for a mix of tasks.

1. Incisors — 12 total, front and center — the small, flat teeth at the very front of the mouth. Dogs use incisors for nibbling, scraping meat off bone, and self-grooming. If you’ve ever watched a dog work at an itch with just the very front of their mouth, that’s the incisors doing their thing. Six on top, six on bottom.

2. Canines — 4 total, one at each corner — the long pointed teeth that people call “fangs.” Dogs use canines for gripping and puncturing. They’re the teeth that hold a tug toy, carry a stick, or, in working dogs, grip when needed. The roots on canines are dramatically long — often longer than the visible tooth itself. Don’t ever assume a broken canine is a minor issue.

3. Premolars — 16 total, behind the canines — these do the real cutting work. Eight on top, eight on bottom, running along the sides of the mouth. When a dog tilts their head sideways to chew a chew stick or a piece of rawhide, they’re using their premolars to shear through it. The carnassial teeth — the large, shearing premolars at the back — are the most powerful teeth in a dog’s mouth.

4. Molars — 10 total, adults only — four on the top jaw, six on the bottom. Molars grind. They’re the last stop before food gets swallowed. Not every dog uses their molars much if they’re eating soft food, which actually matters for tartar buildup — teeth that don’t have mechanical pressure against them accumulate plaque faster.

How the tooth transition actually works

Understanding the timing helps you know what’s normal and what’s not.

1. Weeks 3 to 6: all 28 puppy teeth erupt — they come in fast, they’re extremely sharp (puppies at this age bite their littermates and their mother constantly as part of normal play and feeding), and they’re fully in before most owners even meet their puppy.

2. Months 3 to 4: adult incisors start pushing through first — the front teeth go first, which is why a 4-month-old puppy sometimes looks like they have two rows of front teeth for a few weeks. The baby incisors loosen, fall out, and the adult incisors take their place.

3. Months 4 to 5: canines and premolars follow — the baby canines are usually the last of the deciduous teeth to go. These have long roots and can hang on stubbornly. A baby canine sitting alongside an erupting adult canine is called a retained deciduous tooth, and it’s one of the more common things vets see in young dogs.

4. VCA Animal Hospitals explains that retained baby teeth cause problems because they force adult teeth into abnormal positions, create pockets where bacteria accumulate, and can damage the root of the adult tooth pressing against them. If a baby tooth hasn’t fallen out by the time the adult tooth is fully erupted, the baby tooth usually needs to come out — veterinary extraction, not waiting.

5. Months 5 to 7: molars come in with no predecessor — no baby tooth falls out to make room for the molars, because there were no baby molars. They simply grow in at the back of the jaw where there was open space. By 6 to 7 months, if everything goes normally, your dog has their full adult set of 42.

Tips for keeping all 42 teeth healthy

Cornell University’s veterinary dental guidance puts it bluntly: periodontal disease is the most common condition vets see in dogs, and by age 3, most dogs show early signs of it if home care hasn’t been part of the routine.

• Start brushing early — ideally before 6 months — getting a puppy used to having their mouth handled and their teeth brushed during the teething period sets a much easier baseline than trying to introduce it to a 3-year-old dog who’s never experienced it. Use a soft-bristled brush designed for dogs or a finger brush.
• Never use human toothpaste — xylitol and fluoride, both common in human products, are toxic to dogs. Use dog-specific toothpaste only. Most are flavored with chicken, beef, or peanut butter, which makes the whole process slightly less miserable for everyone.
• Daily brushing is the goal; three times a week is the realistic minimum — the AKC recommends brushing as often as possible. Once a week won’t prevent tartar buildup. Three times a week slows it. Daily brushing is what actually makes a measurable difference.
• Dental chews help, but they don’t replace brushing — products with the Veterinary Oral Health Council (VOHC) seal have been independently tested and shown to reduce plaque or tartar. Use them as a supplement, not a substitute.
• Annual vet dental checks, professional cleaning every 1 to 2 years — home care slows disease progression but doesn’t eliminate it. A professional cleaning under anesthesia gets below the gumline where a toothbrush can’t reach. Small breeds typically need cleanings more frequently than large breeds.
• Watch for bad breath as an early warning sign — mild dog breath is normal; a strong, persistent smell suggests bacterial buildup or early gum disease, not just “that’s just how dogs smell.”

When a missing or extra tooth isn’t cause for alarm

Not every dental situation needs intervention.

• A puppy losing baby teeth between 3 and 7 months is completely normal — you may find tiny teeth on the floor or in their food bowl. Most puppies swallow several without any issue. This is fine.
• Slight bleeding or pink-tinged saliva during active teething is normal — the gums are actively working. A small amount of blood on a chew toy during peak teething months isn’t a red flag.
• Some dogs are naturally missing a tooth or two — congenitally missing teeth (called hypodontia) occur in some breeds with no associated health problems. A vet can confirm if an absent tooth was never there versus lost to disease.
• Chewing behaviour increasing at 4 to 6 months is expected, not a training failure — teething dogs chew more because it relieves gum pressure. Redirecting onto appropriate chew toys is the right response, not punishment.

When to talk to your vet about teeth

• If a baby tooth hasn’t fallen out and the adult tooth is already fully erupted beside it — retained deciduous teeth need veterinary evaluation, usually extraction.
• Any broken adult tooth, even if the dog seems unbothered — broken teeth often have exposed pulp, which becomes infected. Dogs hide pain well. A tooth that looks cracked at the tip may have a fractured root.
• Strong, persistent bad breath that doesn’t resolve — this is usually the first sign of periodontal disease and warrants a dental exam, not just a dental chew.
• Pawing at the mouth, reluctance to chew, or dropping food — these are pain signals. Dogs in dental pain often don’t stop eating, they just show subtle signs that are easy to miss.
• Before your dog’s first professional dental cleaning if you have questions about what the procedure involves or how often they’ll need it.

Conclusion: two sets, a lot of teeth, and they need more care than most owners give them

Knowing how many sets of teeth do dogs have — two, with 28 coming first and 42 following — is the starting point for understanding everything else about your dog’s dental health. The transition between the two sets happens fast, mostly wrapping up before 7 months, and the window to build good home care habits is right in the middle of that period. A dog with well-maintained teeth isn’t just cosmetically better off — they’re avoiding one of the most common and preventable health problems vets see. Start the brushing routine early, watch the teething timeline, and flag anything that looks retained or broken. The teeth are only there once — 42 chances to get the care right.

References

1. PetMD — How Many Teeth Do Dogs Have, and Can They Lose Them?
2. Rutherford Veterinary Hospital — How Many Teeth Do Dogs Have? Puppy vs. Adult
3. VCA Animal Hospitals — Persistent Deciduous Teeth (Baby Teeth) in Dogs
4. Cornell University College of Veterinary Medicine — Dental Disease and Home Dental Care
5. AKC — How to Keep Your Dog’s Teeth Clean