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How your dog's gut can cause hair loss and skin irritation

Updated 20 August 2025
Read time: 7 mins
article author
Written by Charlotte Niblett
Copywriter
article author
Reviewed by Dr Bushra Schuitemaker
Head of Microbiology

Hair loss and inflamed, itchy skin can be a very common issue for dogs. It can affect all breeds, shapes and sizes, but some can be more susceptible than others.

Skin and coat problems can manifest in your dog for a multitude of reasons, including allergies, stress, and many other underlying health issues. But did you know that if your dog struggles with hair loss and itchy skin, it can also be down to dysbiosis and inflammation of the gut?

Here, we’re going to explore skin and coat health in dogs, how exactly their gut and microbiome health can impact it, and what we can do as dog owners to help alleviate their symptoms.

 

How does the gut microbiome impact your dog’s skin and coat health?

As we know, your dog’s gut microbiome is full to the brim with different types of bacteria and fungi that, when rich and balanced, successfully aid functions and processes around the body - and keep things ticking on as they should.

The gut microbiome is linked to the majority of crucial processes in your dog’s body that are responsible for their general health and wellbeing, including but not limited to their digestion, gut health, and immunological function.

When their gut microbiome is unbalanced, or in a state of dysbiosis, these vital processes cannot perform as they should, meaning things like immunological function are disrupted.

With dysbiosis leading to a weaker gut wall and immunity, this can cause what is referred to as ‘leaky gut syndrome’, where bacteria and other harmful things can easily permeate the gut wall and travel around the rest of the body. This can cause their body to react with a myriad of symptoms, including skin irritation and hair loss.

 

dog with shiny coat

 

How does the gut microbiome impact allergies in dogs?

If your dog’s suffering from dysbiosis, when left untreated, it can lead to a breakdown of the gut’s permeability and the strength of their gut wall.

This ‘leaky gut’ syndrome is what can lead to inflammation, and not just of the gut, but other areas of the body too.

As harmful bacteria, toxins, and other things that shouldn’t be let loose from the gut make their way around the body via the bloodstream, alarm bells start to go off in your dog’s body and fight off the nasties. Not only does this bring out allergy-like symptoms, but it can exacerbate existing allergies and symptoms, including skin irritation and hair loss.

 

Hair loss in dogs: Signs and symptoms

No matter how luscious their locks, all dogs can unfortunately suffer from hair loss or alopecia. Some breeds are more prone to hair loss than others, including Daschunds, Chihuahuas, Bulldog breeds, Poodles, Labradors, Huskies, and bigger dogs like Great Danes and Newfoundlands.

Hair loss in dogs is different to moulting or shedding, where longer-haired breeds will lose the under layer of their ‘double coat’ in alignment with the season. This can be managed through regular grooming and will grow back.

When a dog is experiencing hair loss, typically in its early stages, it is isolated to one area of the body and doesn’t seem to fully grow back.

Common areas that dogs experience hair loss include:

  • Around the eyes
  • Bridge of the nose
  • Base of the tail
  • Between their shoulders
  • Ears
  • Chest and belly

 

In some dogs, hair loss can occur seasonally, either in the summer or winter and often grows back. However, in some cases, hair loss in dogs can begin with thinning and get progressively worse over time. Hair loss and excessive shedding can indicate underlying conditions, and can come hand-in-hand with itching and other skin issues.

If your dog seems to be losing their hair, and you often notice them licking, nibbling and scratching the area, be sure to contact your vet for further advice.

 

gut-skin support supplement

 

Skin irritation in dogs: Signs and symptoms

Skin irritation usually accompanies hair loss, but they can happen separately. Irritated, inflamed and itchy skin on your dog can happen in a variety of ways, and can affect many areas of the body. Your dog can experience skin irritation from head to toe, including inside the ear canal.

Signs of skin irritation in dogs include:

  • Redness
  • Sores
  • Hairloss
  • Hives
  • Flakey skin
  • Skin is hot to the touch
  • Excessive licking
  • Chewing - especially when it comes to their paws and toes

 

Skin irritation can affect all dogs, but some breeds are more susceptible to it. Breeds with shorter coats, like Shar-Pei’s and French Bulldogs, are prone to skin issues, but longer-haired breeds like Labradors, Retrievers, Cocker Spaniels and Bichon Frise can also suffer.

 

 

What are other reasons for skin and coat problems in dogs?

Whilst hair loss and skin irritation in dogs can be directly linked to the health of their gut microbiome, it isn’t the only reason why your pooch might be feeling a little itchy. This is what makes a dog Gut Health Test crucial in your investigation into their health. It can indicate or rule out dysbiosis, and guide the next steps in their treatment. Other causes of hair loss and skin irritation in dogs include:

 

  • Parasites. Mange, fleas, and ticks can all cause skin irritation and consequently, hair loss. Internal parasites, such as intestinal worms, can also lead to skin irritation, but can be kept at bay and treated by topical and oral treatments. Whilst these aren’t caused by dysbiosis, strong immunity and a healthy gut microbiome can help your dog fight symptoms caused by parasites.

 

  • Seasonal flank alopecia. Many dogs can experience recurring hair loss in alignment with the seasons, primarily affecting the flank area, which is found on the sides of their body.

 

  • Contact alopecia. Tight collars and harnesses that constantly rub a single area can lead to hair loss. Always make sure you can fit at least two fingers under your dog’s collar and harness to ensure a safe and comfortable fit.

 

  • Trauma to the area. If they’ve recently bumped or hurt an area, they may tend to their injury by licking or nibbling the area. This can cause redness and sometimes hair loss.

 

  • General ageing. Just like humans, dogs can experience hair thinning or loss as they get older. This tends to be no cause for concern and just means in the winter months, it may call for extra blankets or a jumper.

 

  • Skin cancer. On rare occasions, symptoms of skin irritation like redness, bumps, and oozing sores can indicate skin cancer. If your dog has an area of skin that doesn’t seem to be healing, be sure to get them checked by your vet.

 

An illustration of a happy, grey dog with the title, 'What does a healthy gut microbiome look like for your dog?'. It contains text that explains that are Rich and Balanced gut microbiome is what we deem as healthy, and coming from the dog is a circle filled with illustrated bacteria, and arrows showing what they help create. These include acids, sugars, vitamins and neurotransmitters.

How do you know if it’s down to an unbalanced microbiome?

The best way to diagnose or rule out dysbiosis is with a dog Gut Health Test.

Here at Pooch & Mutt, we offer Gut Health Tests powered by microbiologists and dog gut health specialists, to provide an easy and accessible way to really get to know your dog from the inside out.

By analysing a sample of your dog’s poo, a representation of the bacteria in their gut microbiome and how diverse their microbiota is can be gathered. Alongside this, their breed, age, size, medical and genetic history, general lifestyle, and living environment are taken into account to build a comprehensive picture of their gut health, and how it may be impacting the rest of their body.

From this, we can create a diet and supplement plan, strictly tailored to their needs and backed by science, that includes natural ingredients, probiotics, prebiotics and postbiotics. This will help you help your dog to alleviate symptoms stemming from dysbiosis and help provide them with a healthy future.

To find out more about our dog Gut Health Test and products, explore what we have to offer here.

A Gut Health Test for your dog is the first step in truly getting to know your dog, and starting the journey towards great gut health and overall wellbeing. To find out more about our Gut Health Test and what exactly it can do for your dog, check out our blog! Any questions, whether about their gut health or how to perfect their diet, reach out to our expert Pooch & Mutt team.

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