growling
adjective
[ ˈɡraʊlɪŋ ]
• (of an animal, especially a dog) making a low guttural sound in the throat that indicates hostility.
• "putting his hand in front of a growling dog was a dumb thing to do"
growling
noun
• a low guttural noise made in the throat, especially by a dog, to indicate hostility.
• "hearing that growling was so scary"
growl
verb
• (of an animal, especially a dog) make a low guttural sound in the throat.
• "the dogs yapped and growled at his heels"
Origin:
mid 17th century: probably imitative.