Scientists in Hungary recorded growls by dogs in different situations and analyzed the structure of the calls. The growls recorded during play were very different than the other two calls in that they were shorter and higher in pitch.
In an experiment that was also a part of their study, they allowed a dog to approach a high quality food item (a cooked meaty bone) when alone in a room. Then, they piped in the recorded sound of either a growl made when a dog was threatened by a stranger or a growl made by a dog guarding a bone. They tested 41 dogs in this way and found that dogs were significantly more likely to back away from the bone when they heard the bone-guarding growl than when they heard the threatened-by-a-stranger growl.
Dogs have a huge range of vocalizations and yet much remains to be learned about the differences in meanings and structure of their acoustic communication. This study is one step towards a fuller understanding of the vocal repertoire of dogs.
Karen B. London, PhD, is a Certified Applied Animal Behaviorist and Certified Professional Dog Trainer whose clinical work over the last 17 years has focused on the evaluation and treatment of serious behavioral problems in dogs, especially aggression. Karen has been writing the behavior column for The Bark since 2012 and wrote The Bark’s training column and various other articles for eight years before that. She is an adjunct professor in the Department of Biological Sciences at Northern Arizona University, and teaches a tropical field biology course in Costa Rica. Karen writes an animal column, The London Zoo, which appear in The Arizona Daily Sun and is the author of five books on canine training and behavior. She is working on her next book, which she expects to be published in 2017.