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Great Sheep Panic of 1888. The day tens of thousands sheep across Oxfordshire broke from their enclosures and scattered in terror. Nobody knows what scared them.

https://en.m.wikipedia.org/wiki/Great_Sheep_Panic

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The most common cause for panic would be a lower level earthquake. In the 4's on the Richter scale.

Combine this with an intense rainstorm and it's a recipe for panic.

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Sheep flash mob

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Airburst meteor

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Someone would have noticed an airburst over 200sqmi.

Clearly the answer is chupacabra.

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Manbearpig

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In 1921 the scientific journal Nature noted that the 3 November 1888 had been "an intensely dark night, with occasional flashes of lightning"

Could have been metors