Proof against Darwin´s Survival of the Fittest

Previously, everything that I had learnt about Darwin's theories of evolution of species, survival of the fittest etc etc had made sense and I was a believer in apes being our ancestors. However that was before I observed the dogs of Peruvian roads. They are the stupidist animals and just keep breeding! It isn't even as if they don't have road sense, it seems they actually have a gene that forces them into traffic and then change speed or change direction of do something else completely unpredictable. They have obviously been to some hockey training sessions, as they are demonstrating very good examples of 'confuse the opponent tactics', though unfortunately for them this is real life, not a game! (Yes Mr Hermann-Smith, a game!) However I am yet to see a road kill. I don't understand it!!