Why Do Wet Dogs Smell Worse Than Dry Dogs? Explained
If your dog is bathed every few weeks, they will probably never reach the stage of smelling really bad, and will generally smell (to humans at least) of their shampoo, nothing in particular, or simply mildly of “dog,” that intangible and indescribable scent that everyone recognises!
However, a dog that has not had a bath for some time and/or that is very dirty will tend to smell rather unpleasant up close — and you may have noticed this if you have ever patted a slightly stinky dog and then found that your hand smells afterwards!
Even bearing all of that in mind, there is one universal factor that most people can agree on — that a wet dog smells significantly worse than a dry dog, however clean or otherwise that dog was to start with!
This can confuse many dog owners. After all, if your dog smells a bit, going out in the rain and rinsing some of the muck out of their skin and coat might seem like it should help. But as anyone who shares their home with a working dog or a dog that loves to jump in puddles (like the Springer Spaniel) will tell you, a wet or damp dog can really stink out your whole house!
If you have ever wondered why a wet dog smells so bad compared to when they are dry, you are not alone. In this article, we explore why wet dogs smell worse and how you can minimise that odour in your home.
Understanding Dogs, Coats and Natural Cleanliness
Dogs are generally bathed every few weeks or even less often, and they tend to manage reasonably well without smelling too bad, at least for a while after their last wash. This is partly because they aren't naturally as meticulous about grooming as cats are. Cats spend a lot of time licking their coats with their uniquely barbed tongues designed to remove dirt and debris right down to the skin.
Dogs, in contrast, do lick their coats but not with the same thoroughness, and their breath can even contribute unpleasant smells to their fur. Their coats don't lift and part as much as the cat's tongue allows, so dirt and oils can build up under the surface, even if the dog looks clean on top.
The Science Behind the Wet Dog Smell
Both dry and wet dogs carry a variety of microorganisms on their skin and fur, including bacteria and yeast. While many of these microbes are harmless or even beneficial—some protect the skin by forming a natural barrier—their byproducts can cause odours.
When a dog gets wet, the water interacts with the natural oils (sebum) and microorganisms on the skin and coat. This contact causes volatile organic compounds (VOCs) to be released, which are smelly molecules produced by microbial metabolism. Additionally, the moisture provides a damp, warm environment that encourages these microorganisms to become more active, enhancing odour production.
As the wet dog starts to dry, evaporation helps carry these odour-causing compounds into the air, making the wet dog smell stronger and more noticeable. This is similar to how rain enhances the smell of damp earth or fallen leaves. The humid air closely surrounding the drying dog holds more of these odorous molecules, amplifying the scent throughout your home.
How to Reduce the Wet Dog Smell
- Regular but balanced bathing: Bathing your dog every few weeks helps reduce the build-up of odour-causing debris and microorganisms. However, avoid over-bathing as it can strip the coat’s natural protective oils, potentially causing skin issues.
- Use gentle, dog-appropriate shampoos: Select shampoos that preserve the skin’s natural flora and avoid harsh chemicals that disrupt the balance of microorganisms.
- Keep your dog's coat clean and well-groomed: Regular brushing helps remove dirt, dead hair, and spread natural oils evenly, which can reduce stubborn smells.
- Dry your dog thoroughly after getting wet: Using a towel or a dog-safe dryer reduces the time your dog's coat remains damp, limiting microbial activity and reducing odour.
- Maintain dental health: Bad breath can contribute to coat odour, so regular teeth cleaning and vet dental checks are important for overall freshness.
Understanding Your Dog's Natural Smell
It is important to note that every dog has a natural scent, which is not necessarily unpleasant to dog lovers. This smell comes from their skin oils, hormones, and normal skin bacteria. Taking care of your dog with gentle grooming, washing only when needed, and attentive hygiene can keep this natural scent more pleasant.
If you notice a sudden or very strong odour, it can sometimes indicate an underlying health issue, such as skin infections or dental problems. Consulting your vet ensures your dog stays comfortable and healthy.
By combining regular care with an understanding of why wet dogs smell worse, you can keep your dog smelling fresh and enjoy their company in your home without that infamous wet dog smell.
