Woof/wʊf/ Definition 1 of 5Pro Tip 1/3Emotional Indicator Dogs woof to express different needs or feelings, such as excitement or warning. The dog's joyful woof alerted us to his happiness. Pro Tip 2/3Volume Matters A loud woof can indicate urgency or threat, while a soft one might be a greeting. The guard dog's loud woof intimidated the stranger. Pro Tip 3/3Frequency of Woof A constant woof could mean the dog is in need of attention or is anxious. The neighbor's dog's constant woof kept me up all night.