Investigation into dogs’ reactions to wolf howls

Investigation into dogs’ reactions to wolf howls

Research has been conducted into how domestic dogs react to wild wolf howls and whether different breeds respond in different ways

Researchers from the Department of Ethology, Eötvös Loránd University (ELTE), Hungary, have been investigating dogs’ reactions to wolf howls. Are there dogs that are more prone to reply with howling? Are these dogs genetically closer to wolves? To answer these questions, the effects of the dogs’ breed, age and sex on their behaviour were tested in this study.

When one hears a howl in the forest, the first thing that he associates that sound with is the wolf. And it’s true, howling is a characteristic communication form of wolves, but it is also widespread among canine species. They use it for long-distance communication with others, to mark territory boundaries, and also to define the position of the other wolves, which in most cases, also reply with howling. 

Among their domesticated relatives, our best friend the domestic dog, the situation seems a bit more complicated: some breeds, like wolf-like sled dogs, are widely believed to be ‘hard-howlers’, meaning that they howl frequently, even in ‘reply’ to irrelevant sounds like bells, sirens or music, while others never howl at all, even though they are capable doing so. 

See also: Wolf colour linked to ability to survive cdv

wolf howl playbacks

Researchers aimed to solve the mystery of dog howling, and examine whether is it true that specific breeds are more prone to howl and whether this has anything to do with their genetic closeness to wolves.  

To answer these questions, the researchers tested 68 pure-bred family dogs by playing back recordings of wolf howls and observing their reactions in a behavioural laboratory.

To test the effect of the breed, the different breeds’ genetic similarity to wolves (so-called ‘root distance’) was used as a measure. 

First author Fanni Lehoczki said: “According to our results, breeds which are genetically more similar to wolves (‘ancient breeds’), are more prone to reply with their own howls to wolf howl playbacks.

“On the other hand, breeds more distantly related to wolves (‘modern breeds’) typically reacted with barking instead of howls.

“It seems that although howling is present in most breeds’ repertoire, it lost its functionality due to the changed social environment, thus, modern breeds do not use it in adequate situations.”

She advised: “Additionally, we found that breeds which howl more also show more stress-related behaviours in this situation.”

Senior author of the study, Tamás Faragó, a postdoctoral researcher at the Department of Ethology, ELTE, added: “We assume that more ancient breeds, which are genetically closer to wolves, can process the information encoded in wolf howls better than modern breeds.

“Thus, ancient breeds of our study might become stressed by intruding on a pack’s territory and use howling for the sake of avoidance, just as wolves do. 

“Interestingly, this genetic effect on howling occurs only among older dogs (more than five years old), for which an experience- or some age-related personality effect can be a plausible explanation.

“It is possible that – in line with our hypothesis, howling appearing with a higher level of stress is a fear reaction – older dogs are more fearful, which was already suggested by previous studies, but these speculations require further investigation.”

Older dog


Besides the breed and age of the dog, the effect of other features like sex and reproductive status were also tested. 

Lehoczki said: “What we found is that something is going on with the male sex hormones, as there is no difference between intact and spayed females, but intact and neutered males do behave differently.

“Neutered males, which are lacking in testosterone, howl more in response to the playbacks. As neutered males are suggested to be more fearful, this result can be in line with our findings about responsiveness and more stressed behaviour.

“Thus, the dog howl may mean “I am scared, don’t come closer.””

This is the first study specifically investigating howling in domestic dogs. The findings support the hypothesis that domestication and selective breeding by humans fundamentally changed dogs’ vocal repertoire and both the perception and production of howling in dogs.

This insight brings us closer to understanding the history and impact of the profoundly important relationship between humans and their ‘best friends’ the domestic dog.

The results are published in Communications Biology.

Images:  Are there dogs that are more prone to reply with howling? Are these dogs genetically closer to wolves? To answer these questions, the effects of the dogs’ breed, age and sex on their behaviour were tested in this study. Photo credits: Gáti Oszkár Dániel.

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