When exactly do puppies start and finish teething?

Puppies are born without visible teeth, and the first set — 28 deciduous (baby) teeth — begins erupting through the gums at around 3 to 4 weeks of age, with all of them typically in place by 6 weeks (Cornell Riney Canine Health Center, n.d.). Because most puppies go home with new owners between 8 and 12 weeks, many people never actually witness that first eruption; they just notice a mouth already full of tiny, needle-sharp teeth. The permanent set is larger, 42 teeth in total, and begins pushing the baby teeth out starting around 12 weeks of age.

The full transition from baby teeth to adult teeth is generally finished by 6 to 7 months of age, according to the American Veterinary Medical Association, with molars being the last to come in (AVMA, n.d.). Large-breed puppies sometimes finish slightly earlier than toy breeds, and it is normal for the process to look uneven — a puppy might have a full adult set of incisors while still carrying baby canines. Owners who track a rough timeline are better positioned to notice when something is off, like a tooth that should have fallen out weeks earlier.

Why does my puppy suddenly want to chew everything?

The intense chewing drive that peaks between about 3 and 6 months of age is directly tied to the discomfort of erupting adult teeth pushing through inflamed gum tissue, and chewing on firm objects provides counter-pressure that temporarily eases that ache (Merck Veterinary Manual, 2023). This is also the same window in which puppies are learning bite inhibition, so the mouthiness owners see is a mix of physiological need and normal social development rather than a behavior problem to be punished away.

Redirecting the behavior works better than suppressing it. The American Kennel Club Canine Health Foundation notes that offering a rotating selection of textures — rubber, rope, and softer rubber teething rings that can be chilled — gives a teething puppy an appropriate outlet while reducing damage to household items (AKC Canine Health Foundation, n.d.). Chilling a wet washcloth or a rubber chew toy in the freezer for 20 to 30 minutes before giving it to the puppy adds a numbing effect that many puppies find more satisfying than a room-temperature toy.

What symptoms should I actually expect to see during teething?

Visible signs typically include small blood-tinged spots on toys or bedding, mildly swollen or reddened gums, increased drooling, occasional reluctance to eat hard kibble, and finding actual baby teeth on the floor or in a chew toy — all considered normal findings during this stage (Cornell Riney Canine Health Center, n.d.). Losing 20 or more baby teeth over a period of months without ever noticing most of them is common too, since puppies often swallow the tiny teeth without any ill effect.

A low-grade, brief loss of appetite or mild lethargy on the day a tooth is actively working its way out can occur, but it should resolve within a day, not persist. Merck Veterinary Manual notes that teething itself does not typically cause fever, and any elevated temperature during this period should prompt an exam rather than being attributed to teeth alone (Merck Veterinary Manual, 2023).

What is a retained baby tooth, and why does it matter?

A retained (or persistent) deciduous tooth occurs when the adult tooth erupts but the baby tooth fails to fall out, so both sit side by side in the jaw — most commonly seen in the canine teeth of small and toy breeds such as Yorkshire Terriers, Chihuahuas, and Pomeranians (AVMA, n.d.). This crowding traps plaque and food debris between the two teeth, accelerates periodontal disease, and can push the erupting adult tooth into an abnormal position, affecting bite alignment permanently if left uncorrected.

Veterinary dentists generally recommend extraction of any retained baby tooth that is still present once its adult counterpart has fully erupted, and this is commonly done at the time of the spay or neuter procedure around 6 months of age since the puppy is already under anesthesia (Cornell Riney Canine Health Center, n.d.). Owners who notice what looks like a double row of teeth, especially at the front canines, should flag it at the next veterinary visit rather than waiting to see if it resolves on its own, because it will not.

How can I protect my furniture and my hands while my puppy teethes?

Management during this phase relies on prevention as much as redirection: puppy-proofing rooms by removing shoes, cords, and low furniture legs from reach, using exercise pens or crates when a puppy cannot be directly supervised, and keeping a chew toy within arm's reach at all times so it can be swapped in the instant the puppy targets something inappropriate (ASPCA, n.d.). Consistency matters more than any single product — every family member offering the same substitution response prevents the puppy from learning that furniture chewing sometimes works.

For nipping at hands and clothing, the AKC recommends a startle-and-stop approach: a sharp "ouch," withdrawal of attention, and immediate removal of play rather than physical correction, since punishment during this developmental window can undermine bite inhibition learning that protects people later in the dog's life (AKC Canine Health Foundation, n.d.). Puppy socialization classes that run between about 8 and 16 weeks of age are a practical setting for owners to get real-time coaching on this, since instructors see the behavior daily.

Are certain chew toys actually dangerous during teething?

Not all chews are appropriate for a mouth full of loose or partially erupted teeth. Merck Veterinary Manual advises against very hard materials such as real bones, antlers, hooves, and hard nylon bones for teething puppies, since these can fracture immature teeth or damage the erupting adult tooth roots (Merck Veterinary Manual, 2023). A simple rule of thumb used by many veterinary dentists is that if a chew is too hard to leave an indentation when pressed with a thumbnail, it is too hard for a teething puppy.

Safer choices include softer rubber teething toys designed specifically for young dogs, frozen wet washcloths, and puppy-specific dental chews sized appropriately for the breed, all of which flex slightly under bite pressure. Any toy should also be size-appropriate to prevent choking, and owners should discard chew toys once they become small enough to be swallowed whole or develop sharp broken edges.

Does teething affect eating, and should I change my puppy's food?

A temporarily sore mouth can make some puppies hesitant around hard kibble, and softening dry food with a small amount of warm water for 5 to 10 minutes, or temporarily offering a canned puppy food, is a reasonable short-term accommodation during peak teething discomfort (AVMA, n.d.). This should be viewed as a temporary bridge rather than a long-term diet change, and puppies should transition back to their regular food once the adult teeth are through, generally by 7 months.

A puppy who refuses food entirely for more than a day, or who shows signs of pain when opening the mouth to eat rather than mild reluctance with hard textures, is outside the range of expected teething behavior and warrants a veterinary exam to rule out an oral injury, foreign body, or infection unrelated to normal tooth eruption (Merck Veterinary Manual, 2023).