There’s nothing better than snuggling up with your dog after a long day, until you get a whiff of that fishy breath.
You leaned in for a cuddle with your dog, only to be met with a pungent and fishy odor. And while you didn’t expect their breath to be minty fresh, an overwhelming fishy smell can still be concerning.
At first, you might think your pup simply got into something weird. But what if the smell didn’t go away.
A situation like this will leave you wondering: Why does my dogs breath smell like fish. And what if that funky odor isn’t just a result of feeding raw dog food but something more serious.
Read on, as I break down what’s really going on with that smell and how you can fix it.
Here’s why does my dogs breath smell like fish

For starters, let me tell you that sometimes if dogs breath smells like fish it isn’t just about what they ate.
In fact, this can be a sign of anything from an underlying dental disease to anal gland problems, and even digestive trouble.
Let me explain this in detail to help you figure out what’s really behind it.
1. They’ve a dental disease and/or poor oral hygiene
One of the most frequent causes of bad breath in dogs is dental disease.
Here, plaque and tartar buildup creates an environment where bacteria thrive. This, in turn, leads to gingivitis, periodontitis, and tooth decay.
Now, as bacteria breaks down food particles in your pup’s mouth, they release foul-smelling compounds. And it is these compounds that can sometimes mimic the scent of fish.
Here are a few signs of dental disease in dogs to give you an idea:
- Persistent bad breath
- Red or swollen gums
- Yellow or brown tartar buildup on teeth
- Drooling or difficulty chewing
- Pawing at the mouth
Note: Regular brushing and dental chews coupled with the benefits of grain free dog food can help maintain fresh breath. But, if your dog’s breath smells like fish and you notice these symptoms more often, it’s best to schedule a professional dental cleaning with your veterinarian.
2. Anal gland issues also cause breath odor
Although it may seem unrelated, if your dog smells like fish while breathing it could be stemming from anal gland problems.
How?
You see, dogs have two small sacs near their rectum that secrete a fishy-smelling fluid. Normally, these glands empty during bowel movements. But if they become impacted or infected, your dog might lick the area excessively.
The result: This foul odor gets transferred to their mouth.
Some common signs that your dog might have anal gland issues include:
- Scooting on the floor
- Excessive licking of the rear
- A strong fishy smell
- Discomfort while sitting
Pro tip: If you suspect anal gland problems, take my advice and see your veterinarian. Not only can they check for infection but also help prevent future issues.
3. Diet and gastrointestinal issues
It is common knowledge that a dog’s diet plays a significant role in their overall health.
But what if I told you that it also impacts their breath?
Yes, that’s true.
Some commercial dog foods contain fish-based ingredients or omega-3 fatty acids, which can leave a lingering fishy smell in your dog’s mouth.
Moreover, dietary imbalances or digestive issues can also contribute to bad breath. Here, gastrointestinal problems such as acid reflux or an imbalance of gut bacteria might cause foul-smelling breath.
My dog smells like fish: When to be concerned?

It’s normal for dogs to have breath that’s less than fresh, especially after meals or chewing on treats.
But when that odor takes on a fishy smell and doesn’t go away, it could be a red flag.
In fact, persistent fishy breath often points to an underlying health issue that goes beyond the occasional smelly snack.
So, if your dog’s breath constantly smells like fish and is paired with any unusual behaviors or physical symptoms, it’s time to consult your vet.
Here when you should go see a vet if your dogs breath smells like fish:
- Persistent or worsening bad breath: If the odor lingers for days or worsens over time, it’s not normal.
- Signs of dental disease: Swollen or bleeding gums, loose teeth, and yellow or brown tartar buildup are major red flags.
- Excessive licking or scooting: Dogs with anal gland issues often lick their rear or drag their bottom across the floor.
- Difficulty eating or changes in appetite: Oral pain, digestive upset, or illness may cause your dog to eat less or chew awkwardly.
- Vomiting, diarrhea, or other digestive issues: These symptoms may signal a gastrointestinal disorder or imbalance contributing to the foul breath.
Dog breath smells like fish: How to prevent it?

You don’t have to wait for a problem to arise before taking action. After all, with the right habits and care routine, you can significantly reduce the chances of your dog developing fishy breath or more serious health concerns.
I suggest pet parents follow a three-part approach to prevent foul breath, namely, dental hygiene, anal gland maintenance, and digestive health.
Here’s an explanation of each preventive practice:
1. Make dental health a priority
When it comes to preventing fishy breath in dogs, dental care should be your first line of defense.
Here, regular brushing is essential, ideally once a day, using a toothbrush and toothpaste specially made for dogs.
This will remove food particles and prevent plaque buildup. As a result, your pup will be less prone to tartar, gum disease, and seriously foul breath.
Also, you can offer dental chews or toys designed to help reduce plaque naturally in between brushings.
Note: Never use human toothpaste, as it can be harmful to pets.
2. Maintain anal gland health
Anal glands are an often-overlooked but surprisingly common source of fishy breath in dogs.
These small sacs near your dog’s rectum produce a distinctly fishy-smelling secretion, which normally gets released during bowel movements. However, if the glands become impacted or infected, your dog may begin licking the area to relieve discomfort, transferring that fishy odor to their mouth.
A high-fiber diet like the ACANA dog food Freshwater Fish can help here, as it promotes firmer stools that naturally express the glands during bathroom breaks.
3. Monitoring diet and digestive health
Sometimes, the source of your dog’s bad breath lies deeper in the digestive system. That’s because some dog foods, especially dog food containing salmon fish oil, can leave a lasting odor in your pet’s mouth.
You see, while omega-3s are great for your dog’s coat and joints, too much seafood-based content can contribute to that unwanted fishy smell.
Also, food allergies or sensitivities can cause digestive imbalances and lead to smelly breath, gas, or even diarrhea. So, if your dog shows signs of poor digestion, take my advice and consider switching to a more balanced and easily digestible diet.
FAQs about why does my dogs breath smell like fish
Can fishy breath be a sign of a serious health issue?
Yes, persistent fishy breath can indicate more than just a stinky mouth.
You see, dental infections, impacted or infected anal glands, and gastrointestinal problems can all contribute to foul odors.
And if left untreated, these conditions can become serious, causing systemic illness, pain, or behavioral changes.
So, if your dogs breath smells like fish or is accompanied by other symptoms like licking, scooting, vomiting, or appetite loss, it’s best to have a veterinarian perform a check-up.
How often should you brush your dog’s teeth?
Ideally, you should brush your dog’s teeth every day.
Daily brushing is the most effective way to prevent plaque and tartar buildup, which are the main causes of bad breath and dental disease.
For those of you who find it difficult to do daily brushing, aim for at least three to four times per week.
Also, in addition to brushing, provide dental chews and schedule annual professional cleanings with your veterinarian to keep your dog’s mouth in tip-top shape. Even better, dogs love squeaky toys and you can let them chew on them for a natural cleansing effect.
Are certain breeds more prone to anal gland issues?
Yes, some breeds are more susceptible to anal gland problems.
For instance, small and toy breeds such as Chihuahuas, Shih Tzus, Toy Poodles, and Lhasa Apsos often have glands that do not empty efficiently on their own. These dogs might need regular manual expression to prevent impaction or infection.
This also goes for breeds with a history of allergies or digestive sensitivity as they are also more prone to anal gland issues.
Can you express your dog’s anal glands at home?
While it is technically possible to express your dog’s anal glands at home, I don’t recommend it unless you’ve been trained by a veterinarian or groomer.
This process can be unpleasant, messy, and if done incorrectly, it may cause pain or injury to your dog. For instance, the infected or abscessed glands can rupture if improperly handled.
So, it’s best left to a trained vet. Also, since tipping a mobile pet groomer is affordable you can rely on their help.
To sum up
So far in the blog, I am sure you’ve got clear and detailed answers to why does my dogs breath smell like fish.
Also, I am confident that you now have enough information to take appropriate action including regular dental care, monitoring for anal gland issues, and maintaining a balanced diet.
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