What is a dog’s favorite thing? The first things to come to our mind are treats, other dogs, dinnertime, new toys, peanut butter, squirrels, and nap time. Just based on that, the life of a dog seems pretty nice, doesn’t it? If you have a dog, you know that he or she probably has a favorite toy. But for the most part, a dog’s obsession with a certain toy is its own sweet mystery.