Dogs are great. Not on topic, but I have a theory that dogs can identify genetic links from smell - my last dog, sadly demised, was highly territorial if not agressive, and would bark solidly for several minutes when a stranger was in the house. When my wife's cousin from Australia pitched up unseen, just a sniff, pass friend, nary a woof. My current dog is equally territorial, but accepted my kids partners without a woof on first sight, presumably because they carry the scent of my children/identified as being pack mates....