A recent study suggests that dogs may be intentionally manipulating their owners with their facial expressions. Researchers found that dogs move their faces more when humans are paying attention to them, with raising their brows and making puppy dog eyes being the most common expression used. However, when humans have their backs turned or are distracted, the dogs' faces are less active. This indicates that dogs may be aware of how attentive humans are and use their expressions to communicate effectively. Experts compare a dog's thinking age to that of a toddler who uses fake crying and tantrums to get their parents' attention.