To show this was not just because the animals were not getting food, the researchers then tested the dogs alone and found that in this situation the envious canines cooperated longer before stopping.

狗这样表现可不只是因为他们得不到奖赏，研究者稍后单独测验了狗狗们的表现，发现此条件下那妒火中烧的狗在停下不做之前合作了更长的时间。

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Canines do not like seeing their owners offering affection to other creatures, especially other dogs, and react negatively when their owners bring home new partners, the research found.

研究发现，犬齿不喜欢看到他们的主人对别的动物尤其是别的狗表示友好，当主人带回新的宠物，它们则反应消极。

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But not all canines prefer the limited selections on specialty menus.

WSJ: Fine Dining for Well-Heeled Dogs

But first he must get the dog into a harness, which does not come naturally to canines.

BBC: Paws 'Dogcam' aids search-and-rescue with canine tech