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Dogs belong to the canine。When a dog follows its nose， it＇s actually being led by thee key senses。 Sight:a glimpse of the enemy saves them barking up the wrong tree。 Sound: a bark can be a fierce threat， but it＇s also how canines make their long distance calls。 Smell: this tells a dog more than all the other senses put together。Inside its nose are around two hundred million smell sensitive cells， forty times more than in humans。

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Through them the dog＇s brain can pick up signals from one molecule of scent in a million。 It gives the dog: a completely different picture of the world， based on what it smells， rather than what it sees。Flowers are irrelevant to a dog。 So their scent is meaningless。 But food is a serious matter。 What to us is an empty plate， is covered with the smell of chicken to a hungry dog。

狗狗属于犬科劝物。当狗用鼻子嗅着前行时，实际上有三种感觉在起作用：视觉，瞥一眼就知道敌人在哪儿；听觉，犬吠有一种凶猛的威慑力，这也是犬科动物闽相互嗅寻的方式；嗅觉，能给狗提供的信息比其他感觉总和还多。狗的鼻孔大约有2亿左右的嗅觉细胞——比人多40倍。通过这些细胞，它的大脑能从100万个气体分子中筛选出1个。根据所闻而不是所见的东西，展现给狗的是一个完全不同的画面。花对狗来讲无足轻重，所以花香对狗无关紧要。可食物是件大事，对我们来说是一个空盘子，可对一只饥肠辘辘的狗来说却散发着鸡肉的香味