I forget where I read this but apparently dogs have evolved to understand human body language as well. For example, if a dog goes into a room with a stranger a

I forget where I read this but apparently dogs have evolved to understand human body language as well. For example, if a dog goes into a room with a stranger and the stranger then points to one of several buckets, the dog will generally go over to that bucket. This is without any prior training or experience to pointing on the dog's part. This apparently doesn't work with children so the theory was that over time, the dogs that responded best to human body language were more likely to survive due to getting more treats etc.