Why Your Dog Suddenly Smells Like Fish – The Real Causes Every UK Owner Should Know (2026)
- 46 minutes ago
- 5 min read
If your dog suddenly smells fishy, you are not alone.
“Why does my dog smell like fish?” is one of the fastest-growing dog health searches in the UK right now — and most owners instantly think the worst.
The truth is, that strong fish smell usually comes from a few common causes. Some are harmless and easy to fix. Others need veterinary attention quickly.
This guide explains:
Why dogs smell like fish
The most common causes in Staffordshire Bull Terriers, Bulldogs, Frenchies and other muscular breeds
When it is an emergency
How to stop the smell naturally
What helps older dogs stay healthier and more active
Note!
A strong fishy smell that appears suddenly, especially with scooting, licking, swelling, pain or discharge, should always be checked by a vet because infected or impacted anal glands can become serious if left untreated.”
Why Dogs Smell Fishy
The fish smell usually comes from one of these areas:
Anal glands
Skin infections
Ears
Teeth and gums
Urine infections
Flatulence or digestion issues
For many dogs, especially stocky breeds, the most common cause is anal gland problems.
1. Anal Glands – The Most Common Cause
Dogs have two small scent glands beside their anus.
These glands naturally release fluid when your dog poos.
Sometimes they become:
Blocked
Overfilled
Infected
Inflamed
When that happens, owners notice a powerful fishy smell.
Common Signs
Scooting across the floor
Licking the rear constantly
Fish smell on beds or sofas
Swelling near the tail
Pain sitting down
Breeds commonly affected include:
Staffordshire Bull Terriers
French Bulldogs
English Bulldogs
Pugs
XL Bully types
Cane Corsos
2. Fish Smell From the Mouth
Sometimes the smell actually comes from the mouth, not the rear.
Possible causes include:
Dental disease
Rotting teeth
Gum infections
Food trapped between teeth
Older dogs are especially prone to this.
If your dog also has:
bad breath,
drooling,
difficulty eating,
or bleeding gums,
book a vet dental check.
3. Ear Infections
Yeast infections inside the ears can create a sour or fishy smell.
Dogs with floppy or tight ears are more at risk.
Signs Include
Head shaking
Scratching ears
Red skin
Brown wax
Strong odour
Many pets struggle with itchy ears, strong smells, brown waxy discharge, irritation, and discomfort caused by ear mites and canker.
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4. Fishy Smell From Female Dogs
Female dogs can sometimes smell fishy during:
heat cycles,
vaginal infections,
or urinary tract infections.
If there is discharge, swelling, blood, or pain urinating, a vet visit is important.
5. Diet and Digestion Problems
Low-quality food and poor digestion can affect:
skin condition,
gland health,
stools,
and body odour.
Dogs struggling with muscle loss, ageing, or poor gut health often benefit from:
higher protein,
omega oils,
probiotics,
digestive enzymes,
and better quality ingredients.
Senior Dogs and Muscle Loss
Many owners notice fish smells alongside ageing problems:
weaker back legs,
muscle loss,
stiffness,
low energy,
poor recovery,
or weight loss.
As dogs age, maintaining lean muscle becomes harder — especially in active or muscular breeds.
That is why many UK owners now support older dogs with:
quality protein,
omega oils,
amino acids,
joint support,
and digestive support.
How to Help Reduce Fish Smells Naturally
Improve Diet Quality
Look for:
high protein,
omega-3 oils,
probiotics,
digestive enzymes,
and quality ingredients.
Keep Dogs Lean
Overweight dogs have more gland issues and inflammation.
Regular Exercise
Movement helps:
digestion,
circulation,
muscle retention,
and healthy bowel movements.
Grooming and Hygiene
Keep ears clean
Brush teeth regularly
Wash bedding
Check skin folds
When to See a Vet Immediately
Contact your vet if your dog has:
bleeding
swelling near the rear
pain
fever
difficulty pooing
vomiting
sudden weakness
strong ongoing odour
Especially in older dogs.
FAQ
Why does my dog smell like fish but looks healthy?
Usually anal glands, ears, or mild digestive issues. If it continues, get a vet check.
Can dog food cause fishy smells?
Yes. Poor digestion and low-quality food can contribute to gland issues and body odour.
Why does my dog smell fishy after sleeping?
A fishy smell after resting can happen if anal glands leak small amounts of fluid while your dog relaxes or changes position. Dogs with skin folds, ear irritation or dental problems may also smell stronger after sleep.
Why do female dogs sometimes smell fishy?
Female dogs may sometimes develop a stronger odour during heat cycles or due to infections around the urinary or reproductive area. Persistent fishy smells, discharge or irritation should always be checked by a vet.
Can allergies make dogs smell bad?
Yes. Allergies can lead to irritated skin, ear infections and yeast overgrowth, all of which can create strong smells. Dogs with allergies often scratch, lick paws or shake their heads frequentl
Why do my dog’s ears smell fishy?
Fishy or sour-smelling ears can be caused by wax build-up, yeast overgrowth, mites or ear infections. Redness, discharge and scratching are common signs that the ears need attention
When should I worry about a fishy smell from my dog?
Contact your vet if the smell is strong, persistent or happens alongside:
Scooting
Swelling
Pain
Excessive licking
Ear discharge
Bleeding
Vomiting
Loss of appetite
Sudden behaviour changes
Can fishy smells in dogs go away on their own?
Occasional mild smells may disappear naturally, but ongoing odours usually indicate an underlying issue that should not be ignored. Early action often prevents bigger problems later
How can I help keep my dog smelling fresh?
Regular grooming, ear cleaning, good dental care, healthy digestion and high-quality nutrition can all help reduce unpleasant smells in dogs.
Keeping your dog active and maintaining a healthy weight may also support overall wellbeing
Are fishy smells more common in certain dog breeds?
Yes. Breeds with skin folds, sensitive skin, floppy ears or gland problems may be more prone to odours. However, any dog can develop fishy smells at some point
Why does my dog smell like fish but seems healthy?
Sometimes dogs can release a fishy smell from their anal glands without showing obvious illness. Mild gland leakage can happen during stress, excitement or bowel movements. However, if the smell keeps returning, it is worth getting your dog checked by a vet.
Are Staffordshire Bull Terriers prone to anal gland issues?
They can be, especially if overweight or ageing.
Can muscle loss happen quickly in older dogs?
Yes. Senior dogs can lose muscle surprisingly fast without enough activity and nutrition.
Support Your Dog’s Strength, Recovery & Healthy Ageing
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recovery,
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mobility,
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