University of Glasgow researchers measured nicotine levels in the fur of dogs with owners who smoked, finding 1 mg to 11.3 mg in the animals' coats. The upper end of the range is equivalent to smoking as many as 15 cigarettes daily, something experts say has serious consequences for pet health. The researchers plan another study that will use a device in a backpack placed on pets to measure toxin levels, including nicotine, in the environment.

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