The English Springer Spaniels being used by police investigating the disappearance of Madeleine McCann are the same dogs used by South Wales Police during the 2012 search for five-year-old April Jones.
Described by the forces "victim detection dogs" the animals are trained in "locating concealed bodies" and "disaster victim detection", the force said.
The pair have been deployed to Praia da Luz to assist a small team of team of British police officers, working with the Portuguese authorities.
Police have shifted their investigation from the centre of the town where Madeleine McCann went missing to an area of scrubland a mile away.
Madeleine McCann search police are focusing on an area where ground-penetrating radar equipment has picked up an image beneath the soil.
Seven years on from Madeleine McCann's disappearance, British detectives are in Portugal to meet with police.