Do You Know What It Means When a Dog Wags His Tail?

Purina Pro Plan Bright Mind and Dognition teamed up to share five fun facts about your dogs in celebration of Pet Appreciation Week this week. You can learn more about things like how pups learn and what it actually means when they yawn. Scroll through to check them out, and while you're at it, find out more about changing your dog's diet and how often you should be cleaning his food and water dishes.