There has been a report of a dog fatality on Polzeath Beach, possibly related to pollution.
A Facebook and Twitter user posted today that it could be related to Fats, Oils and Grease (FOG) pollution.
Edwina Hannaford, Cornwall councillor for Looe, Polperro and Polruan, said: "Warning notices have been requested and will be placed by Cormac.
"Cory is attempting to collect visible material.
Ms Hannaford added that Cornwall Council was liaising with relevant partners.