Is blue-green algae poisonous to dogs and cats?
Found in still water in warm weather. It can kill a dog within hours.
Call your vet or the Animal PoisonLine straight away, even if your pet seems fine. Many poisons don't cause signs for hours, and treatment works best early. Keep the packet or a photo of what they ate. Don't try to make them sick unless a vet tells you to. Rinse their coat with clean water, wearing gloves if you can.
Why it's a problem
Some algae in lakes, ponds and slow rivers produce toxins that attack the liver or nerves. It often looks like green or blue-green scum or paint on the surface, usually in late summer. Dogs are poisoned by drinking the water or licking their coat after swimming.
Signs to look out for
- Being sick or diarrhoea
- Drooling
- Wobbliness or weakness
- Shaking or fits
- Breathing problems
Getting help
Call your own vet first. If they're closed, their phone line will tell you who covers out of hours. The Animal PoisonLine (01202 509 000, a charge applies) gives 24-hour advice to owners.
This page is general guidance, not a diagnosis. Every pet is different, so always follow your vet's advice.