Puppies drool, chew everything in sight, and often have slightly softer stools during the weeks their teeth are coming through. Teething itself rarely causes true diarrhoea, but it can tip a sensitive gut towards looser motions. Most of the time this settles on its own, but it is worth knowing what is normal and what is not.
What Does Loose Stool Actually Mean in a Teething Puppy?
While teething itself doesn't directly cause significant diarrhoea, it can contribute to softer stools or mild gut upset in puppies. This is often due to increased drooling and swallowing of saliva, stress from discomfort, or ingesting small irritants from chewing during this developmental stage. All of this can make a sensitive digestive system more vulnerable.
It helps to think of teething as one more thing asking something of a gut that is already doing a lot of growing up. A puppy's digestive system is still developing its own balance of bacteria. So anything that adds stress, or changes what goes into the mouth, can show up at the other end. This is something I cover in more depth across my dog nutrition and gut health guides, because so many puppy digestive complaints share the same root causes.
What Else Could Be Behind the Upset Stomach, Alongside Teething?
In most cases, a teething puppy with loose stools has more than one thing going on at once, and teething is rarely the whole story. Here is the rough order of what I would suspect, from most to least likely.
Dietary indiscretion comes first: puppies chew everything, and that includes grass, bits of toy, soil, or whatever has been dropped on the kitchen floor. Stress is close behind. Teething discomfort can raise a puppy's stress levels, and that in turn can affect their delicate digestive system, so a wobbly gut shows it quickly.
A recent food change, even a well-intentioned one, is another common culprit, since puppy guts do not adjust to new proteins or fibres overnight. Further down the list, but never to be dismissed, are intestinal parasites, which are a genuinely common cause of diarrhoea and poor growth in young dogs. The PDSA's guide to diarrhoea in dogs covers these causes in more detail.
In unvaccinated or incompletely vaccinated puppies, canine parvovirus has to stay on the list too, because it causes severe gut inflammation and can be fatal if not caught early. The RSPCA's vaccination guidance for dogs explains why keeping boosters on schedule matters so much at this age.
A puppy's canine gut microbiome explained is still establishing itself in these early months, which is exactly why it reacts more visibly to stress, diet change or a new chew toy than an adult dog's would.
How Urgent Is a Teething Puppy's Loose Stool, Really?
Most teething-related tummy upset is mild and short-lived. The table below is how I would triage it if an owner described the symptoms to me over the phone.
Contact your vet today if you notice any of the following:
- Blood or dark, tarry mucus in the stool
- Repeated vomiting alongside the diarrhoea
- A puppy who seems flat, floppy or unusually quiet
- Refusal to eat for more than a single meal
- Loose stools that have not improved after a couple of days
While some mild digestive upset might coincide with teething, severe or prolonged diarrhoea is typically a sign of something more serious, and it deserves a proper look rather than a wait-and-see approach. For a wider rundown of what causes loose stools outside teething, see this guide to dog diarrhoea causes and when to call your vet.
Supporting a Teething Puppy's Gut Without Overreacting
I would gently push back on one piece of advice that circulates constantly in puppy groups: reaching for human teething gels or human pain relief for a sore mouth. Ingredients in human teething gels and medicines like paracetamol or ibuprofen can be genuinely harmful to dogs, and the dose that is fine for a toddler is not scaled for a ten-week-old puppy.
The same goes for fasting a puppy for an extended period to "settle" loose stools; that decision belongs with your own vet, who can judge whether it is safe for that individual puppy. Young, small and toy-breed puppies in particular can struggle with prolonged food withholding, so this is not something to try without guidance.
One myth worth clearing up here: many owners believe that teething alone can cause proper, watery diarrhoea, and that it is therefore nothing to worry about until the adult teeth are through. In clinical practice, that is not quite right.
Teething can make a gut more sensitive, but true diarrhoea in a teething puppy usually has another cause sitting alongside it. This might be diet, stress, parasites, or something more serious. So it is still worth working through the checklist above rather than assuming the teeth explain everything.
What actually helps is much less dramatic. Keep the diet consistent rather than swapping foods to chase a firmer stool. Offer safe chew toys so the puppy has something appropriate to gnaw on instead of furniture or garden debris.
Keep an eye on stool consistency day to day so you notice a change early rather than three days in. A consistent diet and appropriate chew toys can help reduce some of the digestive disturbances puppies may experience during teething, and cutting general stress, through a calm routine and a quiet place to rest, plays its part too.
Keeping a Growing Puppy's Gut Settled Beyond Teething
Prevention here is mostly about consistency rather than any single fix. Sticking with one diet, introducing new foods slowly, and keeping worming and parasite control up to date all reduce the number of things that can upset a young gut at once. If you are unsure which gaps genuinely matter for your puppy's age and breed, the Juno puppy supplement needs quiz is a reasonable way to work that out before buying anything.
Two ingredients are worth mentioning for a puppy whose stools wobble easily. Slippery elm is a natural source of mucilage, a gel-like fibre that coats and soothes the gut lining. Chicory root inulin is a prebiotic fibre. This means it feeds the helpful bacteria already living in the gut, so they can keep the balance tipped in the right direction.
Both are in Juno Daily, a gut-first supplement, because so many of the stool problems seen in practice trace back to an unsettled gut rather than a single dramatic cause. It is worth being clear, though: a daily supplement supports a puppy who is broadly well. It is not a treatment for a puppy passing blood, vomiting repeatedly, or losing condition. Those puppies need a vet appointment, not a scoop added to breakfast.
For background on how that balance works day to day, this piece on dog gut microbiome covers it in more detail, and there is a broader look at managing a sensitive stomach in dogs for puppies who seem to react to everything.
If your puppy's digestion feels like it wobbles with every small change, the sensible next step is a consistent diet and proper chew toys, alongside Juno Daily, rather than reaching for another quick fix. It will not undo a genuine infection or a serious cause of diarrhoea, but for a puppy who is otherwise well, it is one steady thing in a stage of life that already has enough change in it.
Frequently asked questions
Can puppy teething cause an upset stomach?
Yes, indirectly. The discomfort and increased chewing can lead to a mild upset stomach due to stress, swallowing excess saliva, or ingesting small irritants from chewing on various objects.
Do puppies get diarrhoea when teething?
Severe diarrhoea is not a direct teething symptom. However, some puppies may experience softer stools or mild, temporary diarrhoea, often linked to secondary factors like diet changes, stress, or ingesting foreign material.
What are the common symptoms of puppy teething?
Common signs include increased chewing on objects, excessive drooling, minor gum swelling, reduced appetite, and vocalisation due to discomfort.
How long does puppy diarrhoea last?
Mild, temporary loose stools linked to teething should resolve quickly, usually within 24 to 48 hours. Persistent or severe diarrhoea warrants immediate veterinary attention to rule out other causes.
What helps a puppy with an upset stomach from teething?
Ensure they have safe chew toys, maintain a consistent diet, provide comfort, and monitor stool quality. For persistent upset, a vet check-up is always recommended.
This guide is for informational purposes only and does not constitute veterinary advice. Always consult your vet before making changes to your dog's diet, supplement routine, or healthcare plan.
