Yep these particular dogs were supposed to be the best at the time if I'm not mistaken. Why did the family try to discredit the dogs? Instinctual self-defence? Or reluctance to give up hope for Madeleine? Afterall, cadaver odour is transferable and from some reports I've read 10 minutes is long enough for the odour to permeate the area where the body lay. Putting aside our own particular biases and the parents wotdunnit theory for now. Could SY have been digging in the area, because they believe she may have died in the apartment and perhaps the burglar scenario or some theory in that spectrum makes some sense here?
The family needed to get assurance and advice on the evidential reliability of the dogs.
After all, it seems that it was on the dogs uncorroborated evidence that they were made arquido.
They knew that they had nothing to do with her disappearance and answers were needed.
They must have been very frightened, in a strange country with alien laws and language.
I believe SC were doing, what had to be done to prove or eliminate, by searching for a link to Maddie's disappearance, which could be in the form of her belongings or something of a more sinister nature.
Although nothing has been found as yet, does not mean that it doesn't exist, unless of course she was transported away from the area by the culprit.
The dogs alerts could have been for various reasons, but because they did alert, there will always be people who believe that a body had to have been present and also believe that it had to be Maddie's.
I am sure when you have had a good read around the forum, you will come to your own beliefs eventually.