06/28/2011 12:34 pm ET | Updated Aug 28, 2011

Chihuahua Becomes Sheepdog In U.K. Shelter (VIDEO)

LONDON (AP) -- Nancy's not your typical sheepdog.

This once mangy Chihuahua was brought into a London animal home two years ago with a skin disease so severe that she had to be hand-reared by a shelter employee.

Now the 2 1/2 pound (approximately 1 kilogram) rescue dog has been filmed bounding after sheep several times her size, chasing them around a small enclosure in southern England.

The video released by the Battersea Dogs & Cats Home is an attempt to "prove that rescue dogs really can do anything," owner Ali Taylor said in a statement Tuesday.

Taylor said she trained Nancy following several trips to various farms, but cautioned against others deploying their dogs for sheep herding duties.

Do it only with "proper supervision from an expert," she said.