About two months after her disappearance, in July 0f 2007, specially trained springer spaniel dogs were sent to Portugal from the UK. One dog was trained to find traces of human blood. The other dog was trained to detect the scent of a human corpse.
Although the dogs made a thorough search of the entire resort, the only time they alerted their handlers was when they entered the apartment where the McCanns had stayed. The dogs paid particular attention to a spot just behind the sofa in the living room. They also noticed a space under the veranda in the bedroom that Kate and Gerry had used.