Years ago, my sister moved house when she got married, and took her dog with her in the car. - A journey of five miles. The next day, the dog escaped and eventually turned up back at my mums house where she lived before. My question is this, - if the dog went in the car and had no way of knowing where it had travelled to, how did it find its way back "home". Do dogs have a directional sense similar to homing pigeons ?