A Gisborne pet dog has dug up a grenade that has the firing pin in place - an army ammunitions expert is on the way

A pet dog in Gisborne has sparked a police call out after digging up an unexploded grenade.

The dog made the discovery around midday today and the residents at the address put the grenade in their laundry and immediately called Police.

Police have called in an army ammunitions expert from Trentham.

They say the grenade is extremely old, quite corroded and still has the firing pin in place.