Rex and Zarus can track individual target scent and within the first 24 hours is best. They are used to searching in open areas not residential.
Fernandes – Dog: Rex/ Zarus 4 May 2007
At about 23h00 the extra teams that had been requested for reinforcement arrived (Officer Rosa with Oscar and Officer Martins with Fusco, both from the search and rescue unit and Officer Fernandes with Rex and Zarus from the tracking team).
After the officers had been updated about facts relating to the disappearance, they tried to reconstruct the route the girl might have taken with the two tracker dogs. For this purpose the dogs were given a blanket to sniff, provided by the parents, which had been used by Madeleine.
Beginning to follow the track using Rex, from the door of apartment 5 A (the place where the girl had been sleeping) he would always head in the direction of Block 4, leaving block 5 the dog would turn to the left, pass by a metal access door to a path existing between the apartments blocks to the leisure area (restaurant, pool and playground). Immediately another attempt at reconstruction was made using the dog Zarus, who, in general terms, ended up following the same route as Rex and having the same behaviour.
It is important to state that this tracking work was carried out in an urban area and more than 24 hours after the girl's disappearance and numerous persons had passed along the path the dogs were tracking. It should also be stated that the path the dogs followed within the resort was practically totally surrounded by walls and the concentration of odours was stronger as they were protected from the wind. The searches finished at about 01h30.