Two pregnant ewes sustained severe wounds to their heads after being attacked in a field on Glebe Road, Bowness on Windermere.
Police believe the attacks have been by dogs who have been off leads, unattended and allowed to chase sheep in fields.
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More than 100,000 Rugby fans are expected in the city this weekend as St James' Park hosts its final match World Cup match.
Mainly dry, odd shower - feeling cooler on Sunday
What has the weekend weather got in store for the Border region?