Rahul Somvanshi
Thousands of dark, slug-like marine creatures have blanketed the sand at Aslings Beach in Eden, on New South Wales’s Far South Coast, prompting an urgent public health alert for anyone walking a dog near the water. The creatures are sea hares (*Aplysia* species), large soft-bodied marine mollusks that can be toxic to dogs. Bega Valley Shire Council issued formal warnings on October 13 and updated them on October 20, 2026, instructing dog owners to keep all pets on leads and away from the shoreline. The council has identified the mass stranding as associated with red macroalgae in local waters.
If your dog investigates seaweed or licks a dark, slug-like creature along Far South Coast beaches, act immediately. Symptoms of sea hare poisoning in dogs—including excessive drooling, hind-leg weakness, muscle tremors, and sudden collapse—can develop rapidly. Do not wait for symptoms to worsen; leash your pet, keep them away from Aslings Beach, and rush them to the nearest veterinary clinic. Sea hares can also cause skin irritation in people who handle them directly.
Recognizing Symptoms: Why Timing Determines Survival
The real toxicological story is more complex—and more dangerous—than most coverage has communicated. Media reports regularly warn that sea hares “release deadly purple ink,” but the Animal Poisons Helpline Australia confirms the purple pigment is relatively harmless. The genuine threat comes from compounds concentrated in the creature’s skin and digestive tissues. Sea hares do not synthesize these compounds themselves; they can bioaccumulate them from the algae they feed on. By the time they wash ashore after a post-reproductive die-off, their tissue may carry toxic concentrations.
The danger does not necessarily disappear when the creature dries out. Desiccated sea hare carcasses on the high-tide line can retain harmful compounds. Owners should keep dogs away from any sea hare carcasses and any surrounding seaweed or wet sand where animals have gathered in numbers.
Sea hare strandings of this type follow mass post-spawning die-offs that bring animals into the shallows in large numbers. Bega Valley Shire Council will issue a formal beach reopening notice once tidal action clears the stranding. Dog walkers at other Far South Coast beaches should also remain vigilant and keep dogs on leads near the waterline. Previous Karmactive coverage of coastal beach hazards for dog owners and NSW coastal marine mortality events provides relevant local context; Australian companion animal municipal regulations cover the broader framework of pet safety governance.
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