Cats yawn to intake more air or to stay alert. Cats may yawn due to boredom or in order to communicate. Cats may yawn because it’s contagious or because they want to sleep. Scary fangs. Shutterstock Image - Cats yawn to intake more air or to stay alert. Cats may yawn due to boredom or in order to communicate. Cats may yawn because it’s contagious or because they want to sleep. Scary fangs. - ID: 685337161