The veterinarian urged dog owners to be 'vigilant' of a hidden danger on UK beaches this May Bank Holiday.
A veterinary expert is advising dog owners to watch out for a common sight on the shoreline that could prove life-threatening for their pets.
As seasonal dog bans come into effect at hundreds of popular resort beaches from May 1st, pet owners are expected to head to more remote stretches of coastline.
However, experts warn that these "wilder" beaches often have significantly higher volumes of washed-up seaweed - an item that can be fatal to dogs.
Dr. Charlotte Inness, an experienced vet and founder of VetMedi.co.uk, says that while owners are looking for places where dogs can run off-lead to avoid £1,000 fines, they must watch what their pets are scavenging.
“A coastal stroll is a great way to enjoy the great outdoors, especially as many councils have now reintroduced seasonal beach bans,” says Dr. Inness.
“But while these quieter seaside visits bring benefits, washed-up seaweed on beachfronts can cause significant health risks."
She warned: "If left untreated, it can lead to serious internal blockages or toxicity that may prove fatal.”
While resort beaches are often raked and maintained, more rural stretches see large mats of seaweed accumulate, raising the risk for curious canines.
The warning comes as millions of Britons prepare to hit the roads for the 2026 May Day weekend.
While humans tend to avoid the piles of seaweed on the sand, it can be a major temptation for pets.
Dr. Inness explains that while some seaweed is used in healthy pet supplements, the raw variety found on the beach is a "different matter entirely."
She explained: “When washed up fresh from the sea, seaweed is rife with saltwater and often covered in sand."
Saltwater contains high levels of sodium which can lead to dehydration, vomiting, lethargy and - in severe cases - seizures.
Even when seaweed appears dry, the danger remains. If ingested, dried seaweed rehydrates and expands inside the dog. This leads to intestinal blockages that can become life-threatening emergencies in a matter of hours.
Hidden toxins can also be present in the plants, including harmful bacteria, parasites, or ocean contaminants.
Symptoms to look out for
If you suspect your dog has ingested seaweed, you must monitor them closely.
Symptoms can manifest in just a few hours. Owners should look out for:
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Vomiting and diarrhea
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Excessive drooling
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Dehydration or excessive thirst
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Loss of appetite
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Lethargy and unusual fatigue
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Shaking or trembling
Dr. Inness stressed: “Always carry fresh water to prevent your pet from drinking seawater, and maintain constant supervision.”
She concluded: “If you suspect your dog has eaten seaweed or is displaying worrying symptoms, contact a vet immediately.
“Time is of the essence; a few hours can be the difference between recovery and tragedy.”
