Well, pets are not the key for every person. But pets are present. Pets live for right this instant. If you can talk to your pet, they are looking around, right now, considering what is good (or what they need) right now. Generally pets live very in the moment. When you pet your dog, or ride your horse, you can tap into that space of feeling present. Consider living in that space of being present. In your present, what is? This is the key to happiness.