The dog and owner were played dog growls while images of a large and small dog were projected onto the screen. The experiment was recorded with video cameras.

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Dogs are able to tell how big another dog is just by listening to its growl, a new study has found.

Scientists studied 96 different dogs from a variety of breeds and ages. One group of 24 dogs were shown two images projected onto a screen, one of a large dog, the other a small one.

The dogs were then played the recording of growl from either small or large dog which came from between the two images. The dogs were filmed to see which of the images they looked at first and for longest. ...（点击《每日邮报》查看原文）

狗狗能靠同类吠叫判断对方身型

       据《每日邮报》称，一份新的科学研究发现，狗可以通过听同类的吠叫就能判断出对方的身型大小。

       科学家总共研究了96条不同品种和年龄的狗。譬如，他们给其中一组24条狗投影了两种剪影，一个剪影是大狗，一个剪影是小狗。

       然后他们给这些狗分别播放了大狗和小狗的吠叫。他们拍下了这群狗在听到某一种吠叫后，首先盯着哪个剪影看，以及盯着哪个剪影的时间最长。

       近日他们把研究结果发表在了PLoS ONE网络日志上。结果表明，24条狗中，有20条都能根据犬吠声，首先盯住正确身形大小的剪影看，并盯的时间最长。

       这群匈牙利布达佩斯特埃奥特沃斯-罗隆德大学的研究者们研究的是狗会用特别的吠声来保护他们的食物。最新的研究结果也表明，狗一般不会隐瞒它们的身形大小。