Why Does My Dog Smell of Fish? Causes & Solutions

Introduction

If you’ve noticed a strong fishy smell coming from your dog, you’re not alone. Many dog owners experience this issue, and while it might be unpleasant, it’s usually an indicator of an underlying health concern. From anal gland issues to dietary causes, this guide will help you understand why your dog smells of fish and what you can do about it.

Common Causes of a Fishy Smell in Dogs

1. Anal Glands (Most Common Cause)

Dogs have anal sacs located on either side of their anus, which release a fishy-smelling secretion. These glands naturally express when a dog defecates, but if they become impacted, infected, or overactive, they can produce a strong fishy odour.

Signs of Anal Gland Issues:

• Scooting (dragging their rear on the ground)
• Excessive licking of the anus
• Swelling or discomfort in the rear area
• A persistent fishy smell even after bathing

Solution:

• Have your vet check the glands and express them if necessary.
• Increase fibre in your dog’s diet to encourage natural expression.
• Regular exercise can help prevent gland problems.

2. Dental Problems & Bad Breath

A fishy smell coming from your dog’s mouth may indicate dental disease, gum infections, or plaque buildup. Bacteria in the mouth can create foul odours, which may resemble a fishy scent.

Signs of Dental Issues:

• Bad breath (halitosis)
• Drooling or difficulty eating
• Yellow or brown plaque on teeth

Solution:

• Brush your dog’s teeth regularly with dog-safe toothpaste.
• Provide dental chews and professional cleanings as needed.
• Ensure your dog has a balanced diet to support oral health.

3. Diet & Digestive Issues

Certain foods, particularly fish-based diets, can contribute to a noticeable fishy smell. Additionally, digestive problems like indigestion or acid reflux can cause bad breath with a fishy odour.

Solution:

• If your dog is on a fish-based diet, try switching to a different protein source.
• Avoid feeding table scraps or low-quality dog food.
• Consult a vet if your dog experiences persistent digestive problems.

4. Urinary Tract Infections (UTIs)

A fishy odour in your dog’s urine may indicate a urinary tract infection (UTI), which is caused by bacterial growth in the bladder.

Signs of a UTI:

• Frequent urination
• Straining to urinate
• Blood in urine
• Excessive licking of the genital area

Solution:

• Visit your vet for a urine test and possible antibiotics.
• Ensure your dog stays well-hydrated.
• Maintain good hygiene, especially for female dogs.

5. Skin & Ear Infections

Bacterial or yeast infections in the skin or ears can produce a strong fishy odour. Dogs with floppy ears (such as Cocker Spaniels and Basset Hounds) are more prone to ear infections.

Signs of Infections:

• Redness, itching, or irritation
• A greasy coat or excessive dandruff
• Head shaking (if ear infection is present)

Solution**:**

• Regularly clean and dry your dog’s ears.
• Use vet-approved shampoos for skin issues.
• Seek medical attention if symptoms persist.

Why Does My Female Dog Smell of Fish?

The question gets asked about female dogs so often that it deserves its own answer. On top of the usual anal gland causes, a fishy smell in girls can come from a urinary infection or from vaginitis, an inflammation that shows up in both puppies and older dogs. Take it seriously in unspayed females: a fishy smell alongside lethargy, a swollen tummy or unusual discharge can point to pyometra, a womb infection that is a genuine emergency. If you see that combination, ring your vet the same day.

Why Does My Puppy Smell of Fish?

Puppies often release a little of their anal gland scent when they are startled, excited or told off, and a sudden fishy whiff during play is usually just that. It fades within the hour and needs no treatment. A puppy that smells fishy all the time, or is scooting and licking their rear, may have glands that are not emptying properly, and that is worth a vet check.

Why Does My Dog Smell of Fish Sometimes, Then It Goes?

An occasional fishy waft that disappears on its own is almost always a small anal gland release. Dogs do this when they are startled, stressed or deeply relaxed, and it needs nothing from you beyond opening a window. The pattern that matters is a smell that arrives and stays. Glands that keep making themselves known are glands that are not emptying naturally, and a vet or groomer can sort them out in minutes.

When to See a Vet

While occasional fishy smells can be normal, seek veterinary help if:

• The odour is persistent and does not improve with hygiene.
• Your dog is displaying signs of pain, swelling, or infection.
• There is blood in their urine or stools.
• Your dog is excessively licking or scooting.

If your dog struggles with the vet, check out our Guide on How to Get a Dog Used to the Vet.

How to Prevent Fishy Odours in Dogs

1. Maintain Good Hygiene

• Bathe your dog with a gentle, dog-specific shampoo.
• Keep the rear area clean to prevent anal gland infections.

2. Regular Vet Check-Ups

• Ensure your dog receives routine check-ups, especially if they have a history of gland or dental issues.

3. Balanced Diet & Hydration

• Feed your dog a high-quality, balanced diet to support their gut and skin health.
• Ensure they always have access to fresh, clean water.

4. Monitor Their Health

• Keep an eye on their behaviour and bodily functions to catch early signs of infection or discomfort.

Conclusion

A fishy smell in dogs can stem from a variety of causes, with anal glands being the most common culprit. However, other factors like dental issues, diet, UTIs, and skin infections may also contribute. While some cases can be managed with regular grooming and dietary changes, persistent odours should be checked by a vet. By maintaining good hygiene and keeping up with vet visits, you can ensure your dog stays healthy and odour-free!