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Blue-green algae 'rise' prompts warning to dog owners

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logon - Blue-green algae 'rise' prompts warning to dog owners

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Marie Keates

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An outbreak of blue-green algae led to the closure of a boating lake in Southampton

Dog owners have been warned to take extra precautions while walking their pets amid a rise in reports of potentially toxic blue-green algae.

The British Veterinary Association (BVA) said it had seen an increase in reports including in Southampton, Edinburgh, Cornwall and Lincolnshire.

Contact with the algae can be fatal for animals if left untreated and can cause rashes and illness to humans.

The BVA urged owners to keep dogs on a lead around affected water.

It follows a number reports of dogs becoming ill or even dying after swimming in water suspected to be contaminated with blue-green algae.

In July, it was reported a King Charles Cavalier died after swimming in a lake at Delamere Forest, Cheshire, which was later closed because of the presence of blue-green algae.

Algae naturally occurs in inland waters such as rivers, streams and lakes and during long periods of warm weather it can multiply and form blooms.

Blue-green algae or cyanobacteria – a type of blooming algae – can produce toxins harmful to both humans and animals.

These toxins can be dangerous for animals if ingested, even in small quantities, the BVA said.

Dogs can swallow algae by drinking water from an affected lake, river or pond or when licking their fur after going for a swim, it added.

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The BVA said symptoms can appear within a few minutes or hours, depending on the type of toxins ingested, and commonly include:

  • vomiting
  • diarrhoea
  • drooling
  • disorientation
  • trouble breathing
  • seizures
  • blood in faeces

If left untreated in animals, the toxins can cause liver damage and ultimately be fatal, the BVA said.

In humans, contact with skin or swallowing contaminated water can cause rashes, vomiting, stomach pains, fever and headaches. In rare cases, the algae can cause liver and brain damage.

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Centre for Ecology & Hydrology

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Algal blooms may be green, blue-green or greenish brown and can produce musty, earthy or grassy odours

It is not possible to tell whether an algal bloom is toxic by looking at it, so the Environment Agency says it is safest to assume it is.

It advises keeping pets and children away from affected water and avoiding contact with skin.

Public health advice says people who come into contact with water containing blue-green algae should shower with fresh water immediately and if they become ill seek medical attention.

BVA Junior Vice President Daniella Dos Santos said there was currently no known antidote for the toxins and prompt veterinary treatment was essential to ensure a good chance of recovery.

“If you suspect your dog has been exposed to blue-green algae, rush it to your local vet without delay,” she added.

Daniel Start, author of Wild Swimming, advises people to check for blue-green algae before going into rivers and lakes, particularly the downwind side of lakes where it tends to accumulate.

He said if the algae is present people should find another spot to swim, with rivers generally less likely to be affected.

How to keep your dog safe

  • Look out for warning signs put up by the Environment Agency or local councils near water
  • Keep dogs on a lead and by your side around water known or suspected to have blue-green algae bloom – don’t let them swim in it or drink from it
  • If your dog has been swimming outside, wash it thoroughly with clean water afterwards
  • Take your pet to a vet immediately if you are concerned it may have ingested toxic algae

Source: British Veterinary Association

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