Not all dog growls are created equal. Most commonly growls are aggressive signals, however even here there are different meanings. One growl can mean, "Back off! This is mine," as in when a dog is ...

"After my dog’s TPLO knee surgery, he has a few times now growled at my wife. It is only when we are sitting in the living room (he is in a confined area still) and she comes home from work through ...