In fact, dogs’ growl detection abilities are so good that, in an experiment, they were able to match the sound of another dog’s growl with a PHOTOGRAPH of that dog. This is a cognitive ability so complex that it has only previously been observed in primates.Dogs also can detect the intent of a growl. For instance, there is a distinct growl that dogs use when they are protecting a bone that they don’t want to share. To learn more about this exciting experiment and its findings, check out this article. Another interesting dog fact: Studies suggest that when dogs encounter something unexpected or new they respond by looking to the left.