Grime doesn't direct his dogs at all does he...? &%+((£
That clip comes across to me as more of a PR promo video than part of a documentary (if ever that was an extract from a longer video).
On the other hand, in the course of general reading, I came across something that made sense to me (no idea where at the moment, not in the Cadaver Dog Handbook as far as I can see as I just checked): handlers are - hopefully - alert to potential visual clues and then get the dog to check out the suspect area.
An imaginary scenario off the top of my head would be searching in the woods and finding a death mask in a tree. That would mean nothing to the dog, but might be a clue to the handler to get Brutus to have a good sniff around it. In broad terms, I don't have a problem with that.
I do, however, find it to be an intriguing coincidence that Eddie happened to alert where team Amaral had photos that they found suspicious for some inexplicable reason: the sofa against the curtain when it was one of the most obvious places for anyone to have checked behind, and the bag / carry-on case that was in one photo but not in one taken later that day. It was hardly a secret that the PJ thought that the McCanns had disposed of her body, so the bestickered Grand Scenic was hardly a shot in the dark either. Heaven knows what the clothes inspection or even the Villa / CC was expected to reveal...