The term ANGRY DOG SOUND is composed of two crossword solutions, GNAR (4 letters) and GRR (3 letters). GNAR is an onomatopoeia used to describe a deep, guttural growl, usually associated with an angry dog. GRR is another onomatopoeia used to describe a short, sharp bark, often associated with an irritated or angry dog. Both words are commonly used to describe the sound a dog makes when it is feeling angry or threatened.