The particularly warm and dry 2025 summer is thought to be linked to a “notable rise” in worm egg count results in UK horses – even among those horses who have historically had low or clear results.

Provisional Met Office statistics, shared on 1 September, confirm that summer 2025 was officially the warmest summer on record for the UK . Westgate Labs, which specialises in parasite control for horses and offers postal worm egg count testing, noticed the pattern through this autumn’s test results in UK horses – and believes the two are linked.

Experts are urging owners to test regularly and poo pick frequently as the “first line of defence” against worm infestations.

“What we’re likely seeing is the impact of a warm summer allowing the larval development phase to speed up, meaning hor

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