半犬(Amphicyon),又名两栖犬或古犬熊,是生存于渐新世末期至中新世早期已灭绝的犬熊属(或称半犬属),其形态像熊及狗。它们是犬熊科的模式属。它们的身体很粗壮,最长达2米,最大的物种较像熊多于狗。它的尾巴及颈部很厚,四肢粗壮,牙齿像狼。它们有可能是杂食性的,与棕熊相似。
通过对研究犬科动物行为的几篇文章进行分析,该研究进一步说明了狗的心智能力类似于两岁到两岁半的儿童。
From an analysis of several studies on canine behavior, the study went on to say that the mental abilities of dogs are similar to those of a child aged between two and two-and-a-half years.
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两岁半的伊莉娅在大丹犬谢恩旁并肩奔跑,这只狗体重超过10英石——相比起来,旁边的腊肠犬似乎有点自卑。
Ilya, aged two and half, runs alongside Great Dane Shane, who weighs more than 10 stone - plus a Daschund who may have an inferiority complex.
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