NATURAL Resources Wales (NRW) has issued a warning over blue-green algae after a dog collapsed and died in North Wales.

Dog owners are being urged to be vigilant following the incident which NRW said occurred in Penmaenmawr in Conwy.

A spokesperson said: "We’ve received a report of possible blue-green algae in rock pools around Penmaen Park near to Penmaenmawr sail club.

"Sadly, a dog has collapsed and died due to suspected algae poisoning.

"If you’re in the area, please keep yourselves and pets away from the water."

Blue-green algae is a term used to describe a group of bacteria, called cyanobacteria. They are not actually algae, but the organisms got this name because they often give the appearance of algae when they clump together in bodies of water.

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Blue-green algae is most common in non-flowing, fresh water such as lakes, ponds and rivers. Certain conditions such as hot summer weather can cause it to thrive and grow rapidly, forming a 'bloom' of blue-green algae on the water. It can also be seen during other times of the year.

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Some types of blue-green algae contain toxins that can are highly poisonous and often fatal to pets. It can also cause illness in people if touched or swallowed.

Dogs are at risk from blue-green algae if they swim in or drink contaminated water, or if they get algae caught in their fur and ingest it while cleaning themselves later on. This is because blooms of blue-green algae can produce harmful toxins which stop a dog’s liver from functioning properly.

Exposure to toxic blue-green algae is often fatal and it can cause long term health problems in dogs that survive. Concentrations of the algae vary throughout the year, but it's best not to run the risk of allowing your dog to come into contact with water where the algae may be present.