Short answer: The classic fishy smell is leaked anal gland fluid – small scent glands on either side of the anus that normally express during pooping. Other possibilities: bacterial yeast infection on the skin, dental disease, ear infection, or (in unspayed females) vaginal infection.
What you should actually do
- Anal glands: pea-sized sacs at 4 and 8 o’clock around the anus. Normal fluid is brown, oily, and sharply fishy.
- Sudden spontaneous expression (scared or excited) leaves smell on furniture – common, no treatment needed beyond cleanup.
- Chronic scooting + recurrent fishy smell = anal gland disease. Treatment: manual expression (vet or groomer), dietary fiber, sometimes surgery.
- Generalized fishy smell with greasy coat suggests seborrhea or yeast overgrowth (Malassezia) – vet-grade shampoo and underlying allergy workup.
- Bad breath + fishy smell = dental disease + drooling on the coat. Dental cleaning + home brushing.
Anal sac disease is one of the most common reasons for vet visits in small breeds and dogs with chronic soft stool (the glands need firm stool against the anal canal to express normally). A high-fiber diet (1-2 tsp plain canned pumpkin daily, or pumpkin chews) often improves chronic cases.
If your dog has impacted glands repeatedly despite manual expression, ask your vet about Glandex or consider surgical anal sacculectomy. The surgery is moderately invasive but eliminates the problem permanently.
Dig deeper
⚕️ Medical Disclaimer
The information on this page is intended for educational purposes only and does not replace a hands-on veterinary examination. Drug doses depend on your dog’s complete clinical picture, concurrent medications, and the exact product formulation. Always confirm dosing with your veterinarian before administering any medication, and contact a 24-hour veterinary emergency service or animal poison control immediately if you suspect a medication overdose or adverse reaction. Editorial standards: every drug dose published on PuppaDogs is cross-checked against multiple authoritative veterinary references and reviewed by PuppaDogs Veterinary Editorial Team before publication.
