A waxy substance, thought to be palm oil, has washed up on the Guernsey coastline.
The GSPCA is warning dog owners to watch out for the oil, which could be toxic to their pets.
"Many of us enjoy the many beaches open to dogs during the winter months, but this waxy substance can be life threatening if eaten by your pet," said the charity's Manager, Steve Byrne.
"Palm oil is a white, oily substance which, if ingested, can kill a dog so please keep a very close eye on them when along the coast.
Pictured: Dog walkers are being warned.
"The main problems are vomiting and diarrhoea and these can lead to dehydration, particularly in young or small dogs. We would suggest anyone with a dog that has eaten palm oil contact their vet immediately for advice, particularly if the dog is already unwell.
"There is no specific treatment, but the dog may need medication to control vomiting and intravenous fluid to treat or prevent dehydration."
Members of the public are advised not to touch the palm oil. Anyone who has picked some up should double wrap it in plastic and dispose of it in their normal refuse.
"The main thing we can do as dog owners is prevent exposure," Mr Byrne added.
Anyone who spots something that could be palm oil is asked to contact the States Environment Services Unit on 717200 during office hours.
Pictured top: What is thought to be palm oil has been found on Guernsey beaches.
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