Turns out that regardless of evolutionary lineage, the animals react in a similar way to life among humans: they lose their antipredator traits. That pattern is especially pronounced for herbivores and for social species.
Dogs are descended from ancient breeds of wolves – very social animals who live together in packs, so it makes sense that a dog would sniff and come closer to investigate what was happening.
We are going to be dead pretty soon and all those cancer stories point us in one direction only: towards the need to stop being a craven, imitative, second hand timid flunkey and herd-animal.