My understanding is that the dogs and car were all disproven. Kate, being a G.P might well have come into contact with death as a G.P here has to visit if a death occurs at home. I think they are supposed to register the cause of death. I would imagine she could have proved what went on before the holiday in her practice from practice records, but I have never heard if that was looked at. The transfer of any 'smell of death' could be from her being at work and then collecting and looking after Madeleine on a day when she was the G.P called to a home with a home bereavement. I think there is also an inquest when that happens, so proof of Kate's contact has to be evident? I Madeleine was at a childminder or nursery, proof of where she was and Kate's subsequent movements would be there as all of them have, by law, to keep records and parents usually sign they took their child.
If there had been a way to prove the Mccanns did anything to Maddie the PJ would have been all over it as they clearly wanted them to be guilty.
On another note, if a window was open and you had two babies in a room, even if you knew there had been a break in, if you believed your other child had been abducted, would you not, perhaps automatically, close that window. Would that explain why it is not open? Would that explain why the window was closed from the inside? I think, if those babies appeared to be asleep, I would also have left them, but closed a window thinking of the draft. (So what was the weather like that night?) Might I do this in a daze, not thinking of the consequences of doing so?