Puppy drooling is usually normal, especially if your pup is between 3 and 6 months old. That’s prime teething territory, and swollen, irritated gums trigger extra saliva production. But drooling can also signal something that needs attention, from a stuck object in the mouth to overheating, so it’s worth understanding the full picture.
Teething Is the Most Common Cause
Puppies start losing their baby teeth around 12 to 16 weeks old, and the process peaks around 6 months before tapering off. During this window, adult teeth are pushing through the gums, causing soreness and inflammation that ramps up saliva production. You’ll likely notice drool on toys, bedding, and your hands during play. This is temporary and resolves on its own once the adult teeth are fully in, typically by 7 to 8 months.
If your puppy is in this age range and the drooling comes and goes (especially during chewing), teething is almost certainly the explanation. Offering frozen chew toys or cold washcloths can soothe their gums and reduce some of the excess drool.
Food, Excitement, and Other Harmless Triggers
Dogs have over 200 million scent receptors, which means the smell of food triggers a much stronger salivation response than you’d expect. Just opening a bag of kibble or cooking dinner can turn on the faucet. This is a completely normal reflex and not a sign of any problem.
Some puppies also drool when they’re excited or overstimulated. Meeting new people, greeting you at the door, or playing with other dogs can all bring on a bout of drooling. If it stops once the excitement settles, there’s nothing to worry about.
Breed Plays a Big Role
Certain breeds drool heavily throughout their entire lives because of their facial structure. Dogs with loose, saggy lips and drooping jowls simply can’t hold saliva in their mouths effectively. Bloodhounds, Mastiffs, Saint Bernards, and Newfoundlands are classic examples. If your puppy is one of these breeds (or a mix), the drooling you’re seeing may just be baseline for them. It tends to get more noticeable as they grow into their adult jowls.
Nausea and Motion Sickness
Drooling is one of the earliest signs of nausea in dogs. The inner ear sends signals to the brain’s vomiting center during car rides, boat trips, or any kind of motion, and the body responds by flooding the mouth with saliva. Puppies are especially prone to motion sickness because their inner ear structures are still developing. You’ll typically see drooling, lip licking, yawning, and sometimes vomiting during or right after travel. The good news: most puppies outgrow car sickness as they mature, and symptoms stop as soon as the motion does.
Nausea from other causes, like eating too fast or a mild stomach upset, produces the same drooling pattern. If your puppy drools and then vomits once but is otherwise acting normal, a brief stomach issue is the likely culprit.
Stress and Anxiety
Puppies experiencing stress or fear often drool and lick excessively. This can happen during thunderstorms, fireworks, visits to the vet, or being left alone for the first time. The drooling is part of the body’s automatic stress response. Other signs to look for include panting, pacing, tucked tail, and whale eye (showing the whites of their eyes). If the drooling is tied to a specific stressful situation and goes away afterward, anxiety is the most likely explanation.
Something Stuck in the Mouth
Sudden, heavy drooling that starts out of nowhere, especially if your puppy is pawing at their face or reluctant to eat, can mean something is lodged in their mouth. Puppies chew on everything, and splinters from sticks, fragments of toys, bone shards, or even string can get wedged between teeth, stuck in the gums, or caught in the back of the throat. If you can safely open your puppy’s mouth and see a visible object, you can try to gently remove it. If you can’t see anything or your puppy won’t let you look, a vet visit is the right call. Cuts or sores on the gums, tongue, or roof of the mouth can also trigger drooling as the body produces extra saliva around the injured area.
Toxic Ingestion
Excessive drooling is one of the first signs that a puppy has eaten something poisonous. Common household toxins include chocolate, grapes, raisins, onions, garlic, certain houseplants (lilies are especially dangerous), cleaning products, antifreeze, pesticides, and human medications like ibuprofen or acetaminophen. If drooling starts suddenly and your puppy also shows vomiting, diarrhea, trembling, or lethargy, poisoning is a serious possibility. Time matters here. The faster you get veterinary help, the better the outcome.
Heatstroke
Puppies overheat faster than adult dogs, and drooling is one of the early warning signs. It typically appears alongside heavy panting, restlessness, red gums or tongue, and an increased heart rate. If heatstroke progresses, you’ll see lethargy, confusion, weakness, collapse, and potentially seizures. This is a life-threatening emergency. Move your puppy to a cool area immediately, offer water, and wet their coat with cool (not ice-cold) water while getting to a vet as quickly as possible. Heatstroke can cause organ failure, so early intervention is critical.
Less Common Medical Causes
In rare cases, chronic drooling in a puppy points to an underlying medical condition. One example is a liver shunt, a congenital defect where blood bypasses the liver instead of flowing through it. When toxins like ammonia build up in the bloodstream and reach the brain, they cause neurological symptoms: drooling, disorientation, bumping into walls, and seizures. This condition is present from birth and usually shows up in the first year of life.
Other possible medical causes include infections in the mouth or throat, digestive issues, and problems with the salivary glands themselves. These are uncommon in puppies but worth considering if the drooling is persistent, getting worse over time, or accompanied by other symptoms like weight loss, poor appetite, or behavioral changes.
How to Tell If It’s Serious
Most puppy drooling falls into the “completely normal” category, especially during teething age. The pattern of the drooling tells you a lot. Drooling that comes and goes with meals, chewing, excitement, or car rides is almost always benign. Drooling that starts suddenly and won’t stop, or that comes with other symptoms, deserves closer attention.
Red flags that warrant a prompt vet visit include drooling paired with vomiting or diarrhea, refusal to eat, visible swelling around the face or mouth, blood in the saliva, difficulty breathing, disorientation, or collapse. If you suspect your puppy ate something toxic, don’t wait for symptoms to worsen.