Laura McKirdy, a vet at Dalston-based Paragon Veterinary Group in Carlisle had to put down a dog which had chewed on its owner's cigarette device.
She said the dog she put down - which was a cross breed - showed signs of the effects of a nicotine overdose.
It had poor co-ordination and was sensitive to light, sound and touch.
She warned owners to treat their e-cigarettes in the same way as they would medicines and keep them out of reach of dogs or anything else that might accidentally eat them.
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A look ahead at the forecast for the Border region
A selection of some of the best sunrise pictures from across the region, sent in by ITV Border viewers.
Chilly start. Some frost in places, icy patches possible too. Cloud and sunny spells today, hazier in the west later