Wondering why does my dog smell like fish? Discover the causes, solutions, and when to see a vet for fishy odors in dogs.
Introduction: Why Does My Dog Smell Like Fish?
If you’ve ever asked yourself, “why does my dog smell like fish?” — you’re not alone. Many dog owners notice an odd, fishy odor coming from their pets and wonder what’s causing it. The good news? It’s usually something treatable. In this article, we’ll unpack why your dog might have this distinctive smell, what health issues it could indicate, and when you should be concerned.
As a pet health writer with over a decade of experience, I’ve encountered this question countless times from concerned owners. From anal gland problems to dietary issues, several culprits might be to blame. Let’s dive in.
Table of Contents

Common Reasons Why Your Dog Smells Like Fish
1. Anal Gland Issues (The #1 Cause)
The most frequent answer to why do my dog smell like fish lies in their anal glands. Dogs have two small sacs located near their anus that secrete a smelly, oily substance to mark territory. Sometimes, these glands can:
- Become impacted
- Infected
- Not empty properly
When this happens, you’ll likely notice a strong fishy smell. Other symptoms include:
- Scooting their rear along the floor
- Excessive licking around the anus
- Swelling or discomfort near the tail
💡 Pro Tip: Routine expression of anal glands by a vet or groomer can prevent this issue.Reference:American Kennel Club – Anal Glands in Dogs
2. Dental Disease
Another possible reason for the fishy scent involves your dog’s mouth. Why does my dog’s breath smell like fish? The answer may be:
- Periodontal disease
- Tooth infections
- Tartar build-up
- Foreign objects stuck in teeth
Dogs with dental issues often have noticeably bad breath, sometimes described as fish-like. Regular dental cleanings and at-home brushing can make a significant difference.
Reference: American Veterinary Medical Association – Pet Dental Care
3. Urinary Tract or Vaginal Infections (Especially in Female Dogs)
Why does my female dog smell like fish? This is a frequently asked question, especially by owners of spayed females. Infections in the urinary tract or vaginal area can cause a distinct fishy odor due to bacterial overgrowth.
Watch for:
- Increased urination
- Straining while peeing
- Licking of the genital area
- Blood in the urine
A vet visit is essential for diagnosis and treatment, usually involving antibiotics.
Reference: Cornell University College of Veterinary Medicine
4. Diet-Related Odors
Sometimes, the answer to why does my dog smell like fish could be their diet. Fish-based dog foods or treats rich in omega-3 fatty acids (from salmon or sardines) might cause a temporary fishy odor.
Tip: Check the ingredients in your dog’s food and treats if you notice a new smell.
5. Skin Infections or Yeast Overgrowth
Skin issues can also be behind the persistent fishy odor. Dogs with allergies or skin fold infections may develop bacterial or yeast infections emitting strong odors.
Symptoms include:
- Red, inflamed skin
- Excessive scratching
- Hair loss
- Greasy or scaly skin
A veterinary check and proper skin treatment are essential.
How to Get Rid of the Fishy Smell on Your Dog
Home Remedies (For Mild Cases)
If the odor is mild and there are no visible signs of infection or discomfort:
- Bathe your dog with a gentle, deodorizing shampoo.
- Clean their anal glands (if trained) or schedule a professional grooming.
- Brush their teeth daily using dog-safe toothpaste.
- Switch to a balanced diet free of fish ingredients temporarily to observe changes.
When to See a Vet
Visit your vet if:
- The smell persists beyond a day or two.
- Your dog scoots or licks excessively.
- You notice swelling, discharge, or changes in appetite or behavior.
Early intervention prevents serious health complications.
Preventing Future Fishy Smells in Dogs
Preventative Tips:
- Schedule regular vet check-ups.
- Maintain dental hygiene.
- Keep your dog’s skin and coat clean.
- Express anal glands as needed.
- Monitor their diet for odor-causing ingredients.

Frequently Asked Questions (FAQs)
1. Why does my dog’s breath smell like fish?
Your dog’s breath might smell like fish due to dental disease, oral infections, or eating fish-based products. Regular dental care can help.
2. Why does my female dog smell like fish?
A fishy odor in female dogs can result from urinary tract or vaginal infections, often accompanied by other symptoms like frequent urination or genital licking.
3. Can dog food cause a fishy smell?
Yes, fish-based foods or treats rich in omega-3 fatty acids can cause a temporary fishy odour in dogs’ breath, skin, or faces.
4. How often should my dog’s anal glands be expressed?
Most dogs naturally express their glands, but some need help every 4-8 weeks. Consult your vet for a proper schedule.
5. Are fishy smells in dogs dangerous?
While not always dangerous, persistent fishy odours often signal underlying issues that need veterinary attention.
Conclusion: Don’t Ignore That Fishy Smell
To sum it up — why does my dog smell like fish? The most common culprit is anal gland issues, but dental disease, infections, diet, and skin conditions can also be to blame. Identifying the cause early and addressing it with home care or veterinary help ensures your dog stays healthy and comfortable.
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Author Bio:
Samantha Grey is a certified pet health writer with 12+ years of experience specializing in canine health, nutrition, and behaviour. Her work has been featured in PetMD, AKC.org, and The Bark. Samantha shares expert tips to help pet owners provide the best care for their furry family members.
References:
- American Kennel Club – Anal Gland Problems
- American Veterinary Medical Association – Pet Dental Care
- Cornell University College of Veterinary Medicine
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