The Broads Authority has told dog and cat owners to be aware of pet products such as spot-on flea treatments that contain harmful insecticides like fipronil and imidacloprid.

If animals that have been treated with them enter a body of water such as a pond, river, lake or ditch, the substances can be washed away and harm the species inside the habitat.

Dog walkers at How Hill (Image: Broads Authority)

The species that are most vulnerable to them on the Broads are dragonflies, damselflies and freshwater........

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