Dog owners have been warned to keep their dogs on a lead after two separate attacks on flocks of sheep.
North Wales Police is investigating after it received a report of a sheep attack in Talysarn, Gwynedd, on 18 February.
Police say a dog was seen running loose in a field at around 3.45pm and went on to injure a pregnant sheep.
PC Michelle Allsup, from the force’s Rural Crime Team, said the fact the sheep was in lamb was “very concerning for its owner”.
“Lambing season is now upon us and farmers are working at all hours to protect their livestock from predators and to ensure their lambs are born fit and healthy,” she added.
“Not only does sheep worrying inflict suffering and distress on the animals, but the impact of these attacks also has a devastating effect for the farming community, both financially and mentally.”
The attack comes after a sheep in lamb was killed and another three were injured in Flintshire last week.
Earlier this month, 22 sheep – including lambs – were killed on a farm in Llannefydd, Conwy county, after police believe a dog entered the shed and panicked the flock into a corner.
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Officers are urging the public to make sure their dogs are kept on a short lead around livestock.
They are also appealing to anyone with information which could be of assistance to get in touch.