Growling is commonly misconceived as plain aggressive vocalization. But primarily, growling is just a form of vocal communication between species. So why do dogs growl when petted?
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A sudden change in behavior often times comes from pain or severe discomfort.
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Many dogs actually dislike being pet on the head or around the muzzle, ears, and paws especially if it wasn’t a part of their socialization training.
When it comes to preferences, dogs are not so different from us. Suddenly being hugged by a stranger or getting a butt slap would throw anyone off.