Yawning starts before you’re born and continues throughout the rest of your life, often associated with being tired or bored
Research demonstrates that yawning may be the result of your body attempting to cool your brain, which gets overheated when you’re sleep deprived or exhausted
Yawning may help you bond more closely with your dog, but you should not experience excessive yawning, which may indicate medical problems such as multiple sclerosis, heart attack or liver failure