Leaky Gut in Dogs: Causes, Symptoms and Care – The Grateful Pet

The symptoms don’t always add up at first. Loose stools that come and go, that one ear infection that keeps coming back, low energy on some days and hyperactivity on others. In isolation, all of this could be disregarded as just normal dog behaviour. Altogether, it tells a completely different story.

If this mish mash of symptoms sound familiar, your dog’s gut might be trying to tell you something.

Gut health plays a far bigger role in your pup’s wellbeing than most owners realise. In fact, many deceptively unrelated issues — be it innocuous skin flare-ups or more obvious digestive discomfort — can often be traced back to gut imbalances. And more often than not, what is (or isn’t) in the feeding bowl is a big part of the picture.

What is Leaky Gut Syndrome in Dogs?

Leaky Gut Syndrome, or scientifically known as increased intestinal permeability, is as its name suggests: when the lining of your dog’s gut becomes compromised. [1]

The gut lining acts as a tightly controlled filter that allows nutrients to pass through into the bloodstream, while keeping harmful substances out. This is regulated by “tight junctions”, tiny protein structures that act as gatekeepers.

When these junctions weaken or grow damaged, unwanted substances like toxins, bacteria, and even undigested food particles can seep through the cracks and into the bloodstream. This results in widespread inflammation that can affect multiple systems in your dog’s body, and can increase the risk of developing other diseases not directly related to the gastrointestinal tract. [2]

Recent studies have further shown that certain canine breeds, like Soft-coated Wheaten Terriers, German Shepherd Dogs, Boxer, and Basenjis, may be genetically predisposed to developing increased intestinal permeability far easier and earlier than expected, making leaky gut a serious and pervasive issue that all dog owners should be on the lookout for. [3]

What Causes Leaky Gut in Dogs?

Leaky gut doesn’t happen overnight — it’s usually the result of multiple factors working together over time.

Dysbiosis

When harmful bacteria begin to outnumber beneficial ones, they can weaken the gut lining and disrupt normal digestion. [4] This gut microbiome imbalance is called Dysbiosis, and is prevalent in roughly 50-60% of dogs with any form of GI issues. [5]

Diet & Food Quality

Highly processed, low-quality ingredients, and excessive fillers such as corn, wheat or soy, in dog food, may contribute to inflammation and microbial imbalance in the gut. [6]

Medications

Certain medications, particularly NSAIDs, have been shown to alter gut permeability in a matter of days. As such, it is important to closely monitor dogs on NSAIDs to catch any early signs of leaky gut. [7]

Chronic Stress

A stressed dog doesn’t just lead to behavioural issues, it has physical consequences on their wellbeing. Elevated cortisol levels can impact gut motility and weaken the intestinal barrier. [8]

Signs of a Leaky Gut in Dogs

What makes gut issues so tricky is that symptoms, especially in the early stages, tend to be very subtle and easy to dismiss. Here are just a few of the most common presentations of leaky gut syndrome.

Digestive Signs

Chronic diarrhoea or soft stools
Gas, bloating, or stomach gurgling
Mucus in stool

External Signs

Recurring ear infections
Itchy skin or hot spots
Yeast odour

Behavioural Changes

Lethargy
Unexplained anxiety

Many of these indicators overlap with other conditions, which is why they’re often misattributed or entirely overlooked. [9]

Why Gut Health Matters for Your Dog’s Overall Wellbeing

Much like in humans, your dog’s gut isn’t just placidly responsible for digestion, but a central contributor to their overall health.

Around 70% of a dog’s immune system is located in the gut, making it a key player in defending against illness. [10] Research also suggests strong connections between gut health and skin conditions, with evidence of changes in the gut microbiome being linked to inflammation and dermatitis. [11]

It doesn’t stop there either. Consider that the gut-brain connection in dogs plays a huge role in mood, stress, and behaviors, meaning an unhealthy gut can manifest as changes in temperament. As discussed previously, stress is also a cause of leaky gut, thereby creating a vicious cycle of poor gut health → stress and lethargy → leaky gut and overall worse gut health.

If you’ve noticed recurring issues, it’s worth exploring the bigger picture by researching or consulting veterinarians to better understand digestive issues in dogs and recognise the common symptoms of digestive problems in dogs early on.

The Best Foods for Dogs with Leaky Gut

For many dogs, the easiest place to start is with high-quality, gently cooked meals that are easier on the digestive system. Unlike heavily processed options, fresh gently cooked dog food tends to be more digestible and better tolerated — especially for dogs with sensitive guts.

For pups needing more targeted support, switching to a specialised digestive support dog food can make a noticeable difference. Diets like The Grateful Pet’s Digestive Support Meals are designed with highly digestible proteins, prebiotic-rich ingredients, and gut-soothing components to help stabilise digestion over time.

You can also layer in functional additions to further support gut health:

Bone broth – a nutrient-dense addition rich in amino acids like glycine, which may help support the gut lining and reduce inflammation. It’s also highly palatable, making it ideal for dogs with low appetite or digestive upset.
Prebiotic-rich fibre – ingredients like pumpkin or chicory root help feed beneficial bacteria in the gut. When fermented, these fibres produce short-chain fatty acids (SCFAs), which play a key role in maintaining gut barrier integrity and reducing harmful bacteria.
Eggs (membranes included) – a simple, highly digestible protein source that’s gentle on sensitive stomachs, with the added bonus of supporting joint health and mobility.

Planning out your furry friend’s meals doesn't need to be overly complicated. The basis of better gut health is providing a combination of balanced, gut-friendly base diet with more targeted add-ons for extra support.

Foods to Avoid for a Leaky Gut in Dogs

Just as important as what you include is what you leave out.

Certain ingredients can disrupt the gut microbiome or worsen inflammation over time [12]:

High-starch fillers that may feed harmful bacteria
Artificial preservatives (e.g. BHA, BHT)
Poor-quality or overly processed ingredients

How to Improve Your Dog’s Gut Health

If your pup’s gut health is becoming a concern and you want to make actionable change, it all starts in the home. We recommend the 3R approach:

Remove any triggers from your dog’s diet or environment
Replenish any necessary nutrients or even consider changing to better quality food
Restore the probiotics and gut supporting bacteria that your dog needs to thrive

Consistency is key here, so although results won’t be instantaneous, keep up the routine to ensure optimal results. On top of that, note that sudden changes in diet can do more harm than good, so ensure any transition in diet is done gradually and monitor your dog’s response.

When Should You See a Vet?

While at home measures should be taken, some cases require professional expertise.

Consider seeing a vet if your dog experiences persistent digestive issues, unexplained weight loss, or chronic skin conditions.

Veterinarians can run tests such as the Dysbiosis Index [13] to assess gut health and bacterial balance, or in some cases even recommend an exclusion diet using novel proteins to help identify triggers and restore gut balance. [14] Having all the necessary information at hand is key to combatting pervasive gut health issues.

Supporting Your Dog’s Gut Health for the Long Term

Gut health isn’t fixed overnight — it’s built through consistent, daily choices.

The right dog food doesn’t just fill your dog’s stomach. It supports their digestion, strengthens their immune system, and helps them feel their best from the inside out.

Because when your dog’s gut is healthy, everything else tends to follow.