What is Woof?
Woof is (noun) 2. the sound made by a dog when it barks A dog goes ‘woof, woof’, a cat goes ‘miaow.’ Your father must be back, I’ve just heard a woof from the garden. (verb) (of a dog) to bark This great black dog rushed out and woofed at me. ?
source: Easier English, Student Dictionary Upper Intermediate Level