going back to the cadaver dog hit. It does not mean someone died in that house. It depends on what the dog is trained to alert to, its ability, and its handler ability. To cite a few case - Thomas Quick in Sweden. At one point thought to be sweden's worst seriel killer admitted to tens of murders of missing people and was found guilty and put in prison. He gave the police the location of 22 grave sites and although not one bit of evidence from these sites indicated a body had ever been there, the recovery dogs used there alerted at each and every site. However it turne dout Quick had made flase confessions whilst on heavy medication and after much leading by police and it doe snot look like he ever killed a single person - in fact for some of the killings he confessed to he has alibis (and strong ones, in one case an entire congregation). So the dog alerts meant nothing, as the places he said he buried people were just random locations and had never had a body there.
then, there is the jersey case, where the dog alerted and nothign was found. In this case the final report also states that the dog may have alerted to tissues containing bodily fluids and that this was in the dogs remit.
There is also the shannon mathews case in the Uk where the dogs alerted and not only was there no body found, but the supposed victim turned up alive and well.
In the caley anthony case a dog handler claimed her dog woudl alert to hair or nail from a living donor
As for the personalities of those involved, no-one here can comment as they have only seen those involved as portrayed in the media at a time of great stress. Think about how we would come across in the media during a criminal investigation - I always wonder if the fact I comment on a crime site would stand against me if the media twisted it (I can just see how commenting on a crime site woudl turn into - obsession with true crime in a red top). I know if I was being door stepped constantly and abuse hurled at me, i would find it difficult to not tell everyone to just s@d off.