The term 'Imitate an Angry Dog' can be solved by two crossword solutions, GNAR (4 letters) and SNARL (5 letters). GNAR is a verb that means to make a deep guttural sound, usually in a threatening manner. It is often used to describe the sound made by an angry dog. SNARL is also a verb that means to growl or bark aggressively, often with bared teeth. It is another sound commonly associated with an angry dog.