Much like humans, dogs are complex creatures with a wide range of personalities, so it helps to know the basics of dog psychology and body language before approaching that adorable Golden Retriever in the park. The best way to initiate contact with a dog (after getting the owner’s permission, of course) is to reach out and let the dog sniff your hand.
If the dog seems pretty comfortable and doesn’t recoil from your hand, the best place to pet a dog is under the chin. The one thing you should never do is immediately start patting the dog’s head. This can be seen as a dominant, aggressive gesture because dogs generally keep their nose to the ground. If a dog feels something touching the top of his head, he might think it’s a bigger dog attacking him and react in a defensive manner. “There’s an old joke that dogs can’t look up," Dr. Burstyn said. "They can, but hardly ever do.”