"We can rule out that the dogs simply distinguish between the pictures based on a simple cue, such as the sight of teeth," said study author Corsin Muller.
研究作者科辛·穆勒说：“我们可以排除狗只是根据简单的线索来区分图片，比如看到牙齿。”
Dogs show their teeth to warn, wag their tails to welcome.
狗露出牙时表示警告，摇摇尾巴则表示欢迎。
Fractured teeth are not uncommon in dogs and cats and are usually the direct result of fight or automobile accidents.
牙齿折断在狗和猫中也不少见，通常是咬斗和汽车事故的直接结果。
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