Several blue dogs have been spotted roaming around the Indian capital of Mumbai.

Blue dogs roam Indian capital

Blue dogs roam Indian capital

Locals were left confused when they saw the mutts wandering the streets.

According to The Sun Online, toxic waste dumped in the Kasadi River in the Navi district of the city is to blame for the unusual colour change.

It's understood that the stray dogs have come into contact with the pollution after paddling through the contaminated river, which is lined with 1,000 factories, in search of food.

Arati Chauhan from the Navi Mumbai Animal Protection Cell was ''shocked'' and said: ''We have spotted almost five such dogs here and have asked the pollution control board to act against such industries.''

One factory making detergents is believed to have released the dye which caused the white dogs to turn blue.

Official complaints have been filed.