David gave his cocker spaniel, Pepper, a thorough bath on Saturday morning — shampoo, rinse, blow-dry, the works. By Sunday the fishy odor was back, strongest near her tail and bedding. Pepper had also been scooting across the living room rug. The bath fixed nothing because the smell was not coming from her coat.
A persistent fishy smell that survives bathing almost always originates below the fur — most commonly from full or infected anal glands. These two small sacs on either side of the anus produce a foul, fishy secretion normally expressed during bowel movements. When they fail to empty, the scent leaks onto the coat, furniture, and anywhere your dog sits. Bathing the surface does not address the source.
Key points at a glance
- A fishy odor that returns after bathing usually comes from anal glands, not dirty fur.
- Anal glands normally empty during defecation; impaction and infection cause leakage and odor.
- Scooting, licking under the tail, and sitting uncomfortably often accompany the smell.
- Manual expression by a groomer or vet provides temporary relief; recurring problems need underlying cause addressed.
- Other fishy-smell causes exist — ear infections, skin fold yeast, and dental disease — but anal glands top the list.
How anal glands cause fishy smell
Anal sacs sit at roughly four and eight o'clock around the anus. Their secretion ranges from thin and yellowish to thick and paste-like, with a distinctive rotten-fish odor. Normal emptying happens when stool presses the sacs during defecation. Problems arise when:
Stool is too soft — Chronic soft stools fail to compress the sacs adequately.
Gland anatomy — Some dogs have narrow ducts or deep sac placement that prevents natural emptying.
Obesity — Excess weight reduces effective pressure during bowel movements.
Infection or abscess — Trapped secretions become infected, producing stronger odor, swelling, and pain.
Pepper's cocker spaniel anatomy and possible soft stools make her a classic candidate.
Anal glands versus other fishy sources
| Source | Clues |
|---|---|
| Anal glands | Smell strongest at rear; scooting; licking under tail |
| Ear infection | Head shaking; brown discharge; odor from ears |
| Skin fold yeast | Odor from lip folds, neck, or tail base; greasy skin |
| Dental disease | Bad breath; red gums; odor from mouth |
| Urinary tract infection | Strong urine smell; frequent urination; straining |
If the smell localizes to Pepper's rear and scooting is present, anal glands are the prime suspect.
What to do about it
Veterinary or professional expression — A vet or experienced groomer can manually empty the sacs. This relieves discomfort and odor temporarily.
Do not express routinely without reason — Over-expression irritates healthy glands and may worsen dysfunction. Express when symptoms appear, not on a fixed schedule unless your vet recommends it.
Address the root cause — Your vet may suggest dietary fiber to firm stools, weight management, allergy treatment for chronic soft stool, or antibiotics if infection is present. Recurrent abscesses sometimes lead to surgical removal of the glands.
Avoid home expression unless trained — Incorrect technique causes pain, rupture, or abscess. External expression is safer than internal for owners, but veterinary guidance prevents injury.
Seek prompt care for swelling near the anus, blood or pus, or extreme pain — abscesses require antibiotics and sometimes surgery.
The bottom line
Pepper's fishy smell that survived a perfect bath points to anal glands, not inadequate shampoo. Impacted or infected sacs leak their distinctive odor onto fur and furniture regardless of how clean the coat looks. Scooting confirms the location. Professional expression brings relief, but recurring episodes deserve a vet workup for stool quality, anatomy, and infection — otherwise David will keep bathing a fishy dog who stays fishy by Monday.
This article is for general information only and is not a substitute for advice from your veterinarian.