Why Does My Dog Smell After Swimming?

The Science Behind Wet Dog Smell

That unmistakable wet dog smell is not actually caused by the water itself. It comes from bacteria and yeast that live naturally on your dog's skin and coat. When the fur gets wet, water breaks down the organic compounds produced by these microorganisms, releasing volatile molecules into the air. Essentially, the smell was always there — water just amplifies it.

Why Swimming Makes It Worse

Swimming in natural water — rivers, lakes, ponds, or the sea — introduces extra bacteria, algae, and organic matter into your dog's coat. Stagnant water is particularly bad, as it contains higher concentrations of microorganisms. Salt water can dry out the skin and leave mineral deposits that trap smells. Even chlorinated pool water can react with the natural oils on your dog's coat and produce unpleasant odours.

If your dog is not dried properly after swimming, the damp environment in their coat becomes a breeding ground for bacteria, making the smell progressively worse over the following hours.

How to Prevent the Smell

Rinse immediately after swimming

A quick freshwater rinse as soon as your dog gets out of the water removes much of the bacteria and organic matter before it has time to multiply. This alone can dramatically reduce the smell.

Wash with a proper dog shampoo

A rinse helps, but a proper wash with a pH-balanced dog shampoo is the most effective way to eliminate post-swimming odour. Our Bugalugs shampoos are formulated to remove bacteria and leave a fresh scent that lasts. The Oatmeal Shampoo is particularly good for dogs who swim regularly, as it soothes skin that may be irritated by lake or salt water.

Dry thoroughly

Damp fur is where bacteria thrive. Using a professional dryer after washing gets your dog fully dry, preventing that lingering musty smell that comes from air-drying a thick coat.

Regular Swimmers Need More Frequent Washes

If your dog swims regularly — whether at the beach, in rivers, or in lakes around Cardiff — you may need to wash them more frequently than the typical four-to-six-week guideline. A quick wash after each swim session keeps odour under control and prevents skin irritation from algae or salt buildup.

With our token bundles, regular washes become much more affordable. No booking needed — just pop in after your walk and leave with a clean, fresh-smelling dog.

When to See a Vet

If the smell persists even after a thorough wash, or if you notice redness, flaking, or excessive scratching, your dog may have a skin infection caused by bacteria or yeast picked up while swimming. Ear infections are also common in dogs that swim frequently. If in doubt, visit your vet for a check-up.