From the files... The dogs were brought back to places they had previously ignored... The PJ found it strange it seems
The PJ may have been unfamiliar with the use of dogs with the attributes of Eddie and Keela but in my opinion they were quick to learn enough to make their own conclusions.
SnipThis summarized description raises a question that we would like to see answered: could the dog be 'marking' not the odours emanated from a cadaver, directly or indirectly (by contagious), but from blood in putrefaction'
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From the screening of the videos, referred previously, done when the dogs were working, some doubts arise. We don't want and we can't take the place of the trainer, we only wish to alert, with this paragraph, to some facts, that according to us, need further clarification.
If the dog is trained to react when he detects what he is looking for, why, in most of the cases, we see the dog passing more than once by that place in an uninterested way, until he finally signals the place where he had already passed several times'
On one of the films, it's possible to see that 'Eddie' sniffs Madeleine's cuddle cat, more than once, bites it, throws it into the air and only after the toy is hidden does he 'mark' it (page 2099). Whys didn't he signal it when he sniffs it on the first time'
Apart from all that was said about the dogs, we must also take into attention the results of the forensic analysis that was performed by the experts on the Scientific Police Laboratory on the day immediately after the facts, and already mentioned where no vestige of blood was found.
http://www.mccannpjfiles.co.uk/PJ/ANALYSIS-11-VOLUMES.htm