A recent study suggests that dogs may be deliberately manipulating their owners with their facial expressions. Researchers found that dogs move their faces more when humans are paying attention to them, and raising their brows to create "puppy dog eyes" was the most commonly-used expression. When humans were distracted, the dogs' facial activity decreased. Experts believe dogs may have the thinking age of a toddler and can use manipulation tactics, such as fake crying or tantrums, to get their owners' attention.