STOCKHOLM (Reuters) - A rubber duck sat in a dog's stomach for five years before being removed by Swedish vets last week, a local newspaper said on Tuesday.

The owner of the Apollo the Boxer dog assumed the toy had dissolved in his stomach over the years as it had not come out any other way, Daily paper Lanstidningen said.

But the owner, from the northern Swedish town of Ostersund, took the animal to a vet when it began vomiting and refused to drink and the toy was removed.

The duck had turned black and gone rock hard the newspaper said on its website, showing a photograph of the toy.