Amy the pig at a dog agility class
Media playback is unsupported on your device

The Seattle pig who thinks she is a dog

One of the stars of a dog agility class in the US state of Washington is a pig called Amy - described by her owner as the smartest ''dog'' she has ever trained.

She has already graduated from the ''puppy manners'' class and has moved on to agility and obedience training.

Go to next video: Millions of wild pigs run amok in US