Beach Safety for Dogs: Heat, Saltwater & Jellyfish Stings

By Sarah Bennett, Certified Animal Nutritionist

Why Beach Days Can Be Risky for Dogs

A beach day looks idyllic — and for most dogs, it genuinely is. But the coastal environment combines several hazards that do not exist on a typical park walk: high heat reflected from both sand and water, saltwater ingestion, sharp marine debris, jellyfish on the shoreline, strong currents, and extended sun exposure on unpigmented skin. None of these risks is unmanageable, but all of them require awareness and preparation to keep your dog safe through a full beach day.

Heat and Sand Burns on Paws

Sand absorbs and radiates heat significantly more intensely than grass or pavement. On a 30°C (86°F) day, dry beach sand can reach surface temperatures of 60°C (140°F) or higher — hot enough to cause serious burns on a dog's paw pads within seconds. The paw test: place the back of your hand on the sand surface for seven seconds. If you cannot hold it there comfortably, it is too hot for your dog's paws.

Strategies for preventing sand burns and overheating:

• Time your beach visits: Go early morning or late afternoon/evening. The hours between 11 am and 3 pm are the most dangerous for both heat stroke and sand burns.
• Dog boots: Lightweight mesh dog boots protect paws from hot sand and sharp shells or debris. Introduce them at home before the beach trip.
• Paw balm: Apply protective paw balm before beach walks — it does not prevent burns from extremely hot sand but provides a barrier against salt and abrasion.
• Keep moving or provide shade: Dogs standing still on hot sand are more at risk than dogs moving toward cooler, wet sand near the water line. Set up your beach base in a shaded area and bring a portable sun canopy your dog can rest under.
• Watch for overheating: Excessive panting, drooling, staggering, and bright red gums are signs of heat stroke. Move to shade, apply cool water to the groin, armpits, and paw pads, and seek emergency vet care immediately.

Saltwater Dangers

Drinking Seawater

This is one of the most common and underestimated beach hazards for dogs. Dogs playing enthusiastically in the surf frequently swallow significant amounts of seawater without their owners realising it. Seawater has a salt concentration of approximately 3.5% — well above the level the kidneys can safely excrete. Even moderate saltwater ingestion causes osmotic diarrhoea, vomiting, and dehydration. Severe ingestion can cause hypernatraemia (salt poisoning), which can be fatal if untreated.

Symptoms of saltwater poisoning include: vomiting, diarrhoea, lethargy, loss of coordination, muscle tremors, and in severe cases, seizures. If you suspect your dog has drunk substantial seawater, offer fresh water immediately and contact your vet.

Prevention: bring plenty of fresh water and a portable bowl, and offer it proactively every 30 minutes during play. Do not wait for your dog to ask — dogs focused on play often do not drink voluntarily until they are already dehydrated and turning to the sea for relief.

Ear Infections

Dogs that swim — particularly floppy-eared breeds like Labradors, Spaniels, and Golden Retrievers — are highly susceptible to otitis externa (swimmer's ear) after beach trips. Saltwater and sand that accumulates in the ear canal create the warm, moist environment that bacteria and yeast thrive in. After every beach swim, gently dry the outer ear with a soft cloth and, for high-risk breeds, use a vet-approved ear cleaning solution to remove residual moisture. Signs of ear infection include head shaking, ear scratching, odour, and discharge — warrant a vet visit.

Jellyfish Stings: What to Do

Jellyfish washed up on the shore are a genuine hazard — even dead jellyfish retain their stinging cells (nematocysts) for hours or days after beaching. Curious dogs may sniff or mouth them, resulting in stings to the face, mouth, or paws. Swallowing a jellyfish can cause vomiting and, in rare cases, anaphylaxis.

If your dog is stung by a jellyfish:

1. Keep your dog calm and move away from the jellyfish.
2. Do not rub the affected area — this activates more nematocysts.
3. Rinse with seawater (not fresh water, which can trigger further nematocyst firing) to remove any remaining tentacle fragments, then remove visible tentacle pieces with a stick, credit card, or gloved hand — not bare fingers.
4. Apply a cold pack wrapped in cloth to reduce swelling and pain.
5. Contact your vet — mild stings can be monitored at home, but facial swelling, difficulty breathing, or collapse require emergency treatment.

Rip Currents and Dog Swimming Safety

Dogs are generally strong swimmers, but they are not immune to rip currents, fatigue, or panic in open water. Dogs that swim out beyond breaking waves are particularly at risk. Rip currents — fast-moving channels of water pulling away from shore — can exhaust even a fit dog rapidly.

• Keep swimming dogs within a safe distance where you could intervene if needed.
• Use a brightly coloured dog life jacket for dogs swimming in surf, open water, or for extended periods — particularly for puppies, senior dogs, or dogs with any health condition.
• Know where the rip currents are before letting your dog enter the water — ask beach lifeguards.
• Always have a leash accessible to help retrieve a struggling dog without putting yourself at risk.

Sun Protection for Dogs

Dogs can get sunburned, and repeated sun exposure can lead to skin cancer — particularly in dogs with white or light-coloured coats, pink skin, short fur, or sparse hair on the nose, ear tips, and belly. High-risk areas include the nose, ear flaps, and the skin around the lips.

• Apply pet-safe sunscreen (never human sunscreen — many contain zinc oxide or PABA, which are toxic to dogs) to exposed areas before beach trips. Reapply after swimming.
• Provide shade: a beach umbrella or canopy your dog can retreat to when not actively swimming or playing.
• Consider a UV-protective dog shirt for dogs with very light or sparse coats.

For further guidance on beach safety, the ASPCA's guide to ocean hazards for dogs and the AVMA's hot weather pet tips are excellent veterinarian-reviewed resources.