By mid-July we can usually tell which dogs have a backyard pool at home before the owner even mentions it. The coat feels a little different under our hands: drier than it should be, sometimes with a flat, brittle texture instead of its usual softness, and every so often a lighter-coated dog comes in with a faint dulling or greenish cast we know isn't natural. Nine times out of ten, the answer is the same: this dog has been in and out of the pool all week, and nobody's been rinsing them off after.
Pools are a great way for a dog to cool off in a Missouri summer, and we're not telling anyone to keep their dog out of the water. But chlorine does real things to skin and coat, and a little routine around swim time goes a long way toward keeping your dog comfortable and looking like themselves.
Why Chlorine Is Hard on a Dog's Coat
A dog's skin and coat rely on natural oils to stay flexible, hold moisture, and give the coat its normal shine. Chlorine is designed to kill bacteria in pool water, and it isn't selective about which oils it strips away in the process — according to the American Kennel Club, repeated chlorine exposure pulls those protective oils out of a dog's skin and coat, which is what leads to the dryness, dullness, and itchiness we see show up at the salon. On dogs with lighter or white coats, that same chemical exposure can leave a subtle yellow or greenish tint behind, similar to what swimmers sometimes notice in their own hair after a lot of pool time.
What We Actually Check For at the Groom Table
When a dog's been swimming heavily, this is what we're looking and feeling for:
- Dry, flaky skin — noticeable when we part the coat, especially along the back and hips.
- A dull, brittle coat — instead of springing back after a brush stroke, the coat feels stiff or straw-like.
- Redness or excess scratching — dogs with already-sensitive skin or allergies tend to react to chlorine faster and more visibly than others.
- Discoloration on light coats — a faint green or yellow tinge, most noticeable on white or cream-colored dogs.
Left unaddressed, dry and itchy skin can turn into a dog scratching or chewing at themselves more than usual, and that kind of over-grooming is one of the ways we see hot spots get started in the middle of summer. It's rarely an emergency, but it's uncomfortable for the dog and it's the kind of thing that's much easier to prevent than to undo.
Before They Jump In
If you know it's going to be a pool day, a leave-in coat conditioner or protective spray applied beforehand can help buffer the coat against chlorine, the same way people put product in their hair before a swim. It's not required for an occasional dip, but it's worth doing if your dog is going to be in and out of the water all afternoon.
The Rinse That Actually Makes a Difference
The single biggest thing you can do is also the simplest: rinse your dog with clean, fresh water as soon as they're done swimming, and rinse longer than feels necessary. A quick splash isn't enough to move chlorine residue out of a full coat — plan on a few minutes of steady rinsing, working the water all the way down to the skin, not just over the surface of the fur. That one habit prevents most of the dryness and buildup we see from casual backyard pool use.
A Weekly Reset During Pool Season
For a dog who's swimming most days, a rinse alone won't fully reset the coat. Once a week during heavy pool season, a proper bath with a moisturizing shampoo helps strip out accumulated chlorine residue and put some of that lost oil back into the coat. We cover what to look for in a shampoo for this exact situation in our guide to choosing the right shampoo for your dog's coat, and we build this kind of reset into our own bath and brush appointments all summer long.
Pool Water Isn't the Only Water to Watch This Summer
If your dog splits time between the backyard pool, a lake, and the sprinkler in the yard, chlorine is just one piece of a bigger summer-water picture. We've written separately about the ear infections that come from any kind of swimming, the way chlorine and lake water both speed up matting in longer or textured coats, and how a freshly clipped coat needs extra sun protection poolside. Between backyard pools and the lake, St. Charles dogs get a lot of water time in July and August, and most of what we see at the salon this time of year traces back to one of those three things.
Our own dogs are no exception — between the two of them, there's rarely a summer week without at least one trip through somebody's sprinkler or kiddie pool, so we're doing the same rinse-down routine at home that we're describing here. If your dog's coat has been feeling a little rough around the edges this pool season, we're at American Puppy in St. Charles and happy to help get it back on track. Book an appointment here.
Frequently Asked Questions
Is chlorine actually bad for dogs' skin and coat?
Yes, in the sense that it strips natural oils from the skin and coat with repeated exposure, which leads to dryness, dullness, and sometimes itchiness or irritation. It's not usually dangerous, but it's uncomfortable for the dog and worth managing.
How soon after swimming should I rinse my dog?
As soon as they're done for the day. Chlorine residue is easiest to rinse out before it dries into the coat, so don't let your dog air-dry in the sun first and rinse later.
Can chlorine change the color of my dog's coat?
It can cause a subtle yellow or greenish tint on light or white coats with heavy, repeated pool exposure. It's a surface discoloration from chemical residue, not a health issue on its own.
Do I need a special shampoo for a dog that swims a lot?
A moisturizing, gentle shampoo used weekly during heavy swim season helps restore oils that chlorine strips away. A harsh or drying shampoo can actually make the dryness worse.
My dog is scratching more since pool season started. Is that from the chlorine?
It's a common cause, especially in dogs with sensitive skin, but persistent or worsening scratching is worth a vet visit to rule out an infection or allergy rather than assuming it's just chlorine dryness.
Is lake water easier on a dog's coat than a chlorinated pool?
Not necessarily — lake and pond water carries its own residue and debris that can dry and stiffen a coat too. Either way, a thorough rinse after swimming is the habit that matters most.