Behavioural responses of Canis familiaris to different tail lengths of a remotely-controlled life-size dog replica

In: Behaviour
Authors: Reimchen 1 and Leaver 2
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  • 1 Department of Biology, University of Victoria, P.O. Box 3020, Victoria, B.C., Canada V8W 3N5
  • 2 Department of Biology, University of Victoria, P.O. Box 3020, Victoria, BC., Canada V8W 3N5

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The tail of dogs and allies (Canidae) is important for intraspecific communication. We used a life-sized dog model and varied the tail length and motion as an experimental method of examining effects of tail-docking on intraspecific signaling in domestic dogs, Canis familiaris. We videotaped interactions of 492 off-leash dogs and quantified size and behaviour of approaching dogs to the model's four tail conditions (short/still, short/wagging, long/still, long/wagging). Larger dogs were less cautious and more likely to approach a long/wagging tail rather than a long/still tail, but did not differ in their approach to a short/still and a short/wagging tail. Using discriminant analyses of behavioural variables, dogs responded with an elevated head and tail to a long/wagging tail model relative to the long/still tail model, but did not show any differences in response to tail motion when the model's tail was short. Our study provides evidence that a longer tail is more effective at conveying different intraspecific cues, such as those provided by tail motion, than a shorter tail and demonstrates the usefulness of robotic models when investigating complex behavioural interactions.

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