Red tide is a bloom of the algae Karenia brevis that releases brevetoxins, neurotoxins that can cause vomiting, tremors, and seizures in a dog - and because the most dangerous exposure comes from eating dead fish or sea foam and from licking a contaminated coat rather than from the water itself, the correct move during a bloom is to keep the dog off the beach entirely, wash it immediately if it does get in, and have a plan for the two or three weeks of daily exercise that just disappeared.
The tell is the smell before it is anything else. You come over the dune line and something is wrong with the air, a sharp catch at the back of your throat, and half the beach is coughing without knowing why. Then you see the fish.
I grew up in Destin. I have watched this arrive more than once. And every single time, the thing I see on the sand that makes me want to grab a collar is a dog walking straight toward a dead mullet with real intent.
What is actually in the water
Red tide is a harmful algal bloom, and on the Gulf Coast it is almost always one organism: Karenia brevis, a microscopic marine algae that produces a family of compounds called brevetoxins.
Brevetoxins are neurotoxins. The Florida Department of Health's guidance for veterinarians describes them as acting on the central nervous system of mammals, birds, and fish, which is why a bloom kills fish by the thousands and why the same water is a genuine hazard to a dog.
The part most owners on this coast do not know is where our blooms come from. According to UF/IFAS extension work out of the Northwest District, conditions in the northern Gulf do not typically spawn red tide on their own. What reaches the Panhandle is usually a bloom that formed off southwest Florida and got pushed up here by weather and currents. That is why our events feel random and why they cluster in the fall.
They are not hypothetical for Okaloosa County. Northwest Florida saw its first confirmed K. brevis bloom in September 2018 in the Destin and Fort Walton Beach area. The Florida Department of Health in Okaloosa issued a bloom notice near James Lee Park in Destin in September 2021, with the organism detected at multiple locations in the county. A coast-wide event in October 2015 lined Panhandle beaches with dead fish.
September and October. Every time.
The exposure route almost nobody plans for
Ask an owner what they are protecting the dog from during red tide and they will say the water. That is the least of it.
The Florida Department of Health and veterinary sources including BluePearl put the priority in a different order. Ingestion is the most dangerous route. A dog that eats a dead fish, or mouths the thick foam that piles at the tideline during a bloom, takes in a concentrated dose. Dead fish on a red tide beach are not carrion. They are dosed.
Second, and this is the one that catches careful owners, is self-grooming. A dog that wades in gets brevetoxin on its coat, then does what every dog does on the drive home and licks itself dry. The exposure happens in your back seat, twenty minutes after you thought you were clear. That is why the standing advice is to wash a dog immediately after any water contact during a bloom, and to mean it - a real rinse, not a towel.
Third is the air. Brevetoxin aerosolizes in surf and onshore wind, which is what is irritating your own throat, and health guidance notes it can carry inland from the shoreline. That aerosol is why people with asthma are told to stay away from the beach during a bloom, and it is a real consideration for a flat-faced dog or any dog with a respiratory history.
What it looks like in a dog
Signs can show up within minutes to hours depending on the dose and the route. Veterinary sources describe neurological, gastrointestinal, and respiratory effects: vomiting and diarrhea, coughing and wheezing, tremors, difficulty walking, and in serious cases seizures.
I am not a veterinarian and this is a hard line for me. If your dog has been on a beach during a bloom and it is vomiting, coughing, unsteady, or twitching, that is an emergency room call, not a wait-and-see. Tell them the dog was on the beach during red tide, because that single sentence changes what they look for. Keeping a stocked canine first-aid kit in the truck is good practice generally, and it does not substitute for a vet here.
The practical rules during a confirmed bloom are unglamorous and they work. Do not take the dog to the beach. If you live on the water, bring outdoor animals in. If the dog gets in anyway, rinse it thoroughly before it can groom. Do not let it near dead fish or foam, ever, and understand that a dog who has decided a dead fish is the best thing on the beach will be faster than you.
Check before you go rather than guessing. The FWC publishes a statewide red tide status map, and Okaloosa County has monitored local water since the 2018 event. Two minutes of checking beats a night at the emergency vet.
The problem underneath the problem
Here is where this stops being a beach safety post and starts being a Kai's Run post.
First, a local fact that surprises people: in Okaloosa County, dogs are not allowed on the public beaches at all. The City of Destin has its own ban on top of the county's. So for most dogs here, the outdoor outlet is somewhere else - the fenced dog parks at Liza Jackson Park in Fort Walton Beach and Nancy Weidenhamer Dog Park in Destin, Walton County's evening and early-morning dog-beach hours for residents and property owners who hold the county permit, or the two designated dog beaches out on Pensacola Beach. That is where the real running happens, where the dog gets to be an animal for forty minutes, and where a week's worth of drive gets spent. A bloom does not last an afternoon. It can sit on a stretch of coast, and push into the passes and bays, for weeks.
So you lose the beach in late September. You have already spent all summer losing the middle of the day to heat, which is the whole reason the pavement heat tool exists and why I wrote about how quickly a Gulf Coast summer takes a dog's conditioning apart. Now the one reliable outlet you had left is gone too.
Energy does not evaporate because the venue closed. A high-drive dog with nowhere to spend it starts spending it on your house, your furniture, and your evening, which is the mechanism I laid out in the piece on what under-exercised energy actually does to a dog. Three weeks of that undoes a lot of training.
And the substitution most people reach for does not cover it. Hitting the dog park instead is a trade of intensity for chaos, and I have written about why the dog park so often fails to tire a dog out. Sprint, stand, sprint, stand, plus arousal you have to unwind afterward. It fills the hour without doing the work.
What actually replaces the beach for a few weeks
The replacement has to be sustained, controlled, and independent of where the wind put the bloom.
Sustained is the operative word. What the beach was giving your dog was twenty to forty minutes of continuous locomotion at a real effort level. Ten minutes of fetch in the yard is not a substitute for that, no matter how hard the dog goes. This is the same distinction I drew in how to tire out a high-energy dog: duration at a steady effort is what changes a dog's afternoon, not intensity in bursts.
Structured mill work fits this window almost too neatly. It is indoors relative to the coast, it does not care what the water is doing, the dog sets the pace on a self-powered belt, and the dose is measurable, which matters if you are trying to hold a dog's conditioning steady through a three-week interruption rather than watching it slide. That is the same argument I make for structured runs generally, applied to a specific local emergency.
Add scent work and problem-solving on top of it, not instead of it. Enrichment lowers a dog's baseline. It does not replace the physical work, and a bloom week is exactly when people talk themselves into believing it does.
Then check the map, and go back to your outdoor routine the day it clears. This coast is worth the wait.
FAQ
Is red tide dangerous to dogs? Yes. Brevetoxins produced by Karenia brevis are neurotoxins, and dogs can be affected by eating dead fish or foam, by licking a contaminated coat, and by inhaling aerosolized toxin near the surf. Keep dogs off the beach during a confirmed bloom.
What are the symptoms of red tide poisoning in a dog? Veterinary sources describe vomiting and diarrhea, coughing or wheezing, tremors, unsteadiness, and in serious cases seizures, appearing within minutes to hours. Treat any of these after beach exposure as an emergency and tell the veterinarian about the red tide.
My dog got in the water during red tide. What do I do? Rinse the dog thoroughly with fresh water before it has a chance to groom itself, because self-grooming turns a coat exposure into an ingestion. Then watch closely for several hours and call your veterinarian if anything looks off.
Does red tide affect the Destin and Fort Walton Beach area? It does, though not every year. Northwest Florida recorded its first confirmed bloom in September 2018 in the Destin and Fort Walton Beach area, and Okaloosa County has issued bloom notices since, most of them in September and October.
How long does a red tide bloom last? There is no fixed answer. Blooms have persisted along Florida coastlines for weeks to months, and local conditions shift with wind and current. Check the FWC status map rather than assuming a bloom that was there yesterday is gone today.
Plan for the gap, not just the day
Most owners handle red tide as a single bad afternoon. It is closer to a season interruption, and the dogs that come out the other side unchanged are the ones whose owners kept the work going somewhere else.
- Kai. I have been told the fish on the beach are not for me. I disagree, and I have been overruled. My human watches me like a hawk out there now, which I choose to take as a compliment.
Free tool: Dog Beach Checker - check whether the spot you use is even legal for a dog, and what is open instead while the bloom sits there.
Kai's Run is not taking dogs yet. Join the launch list and you will hear first when conditioning opens in Destin, Fort Walton Beach, Niceville, and the rest of the Emerald Coast.