The dogs are not the same. There are those who only wear their owners and some people around themselves, and there is someone who is happy with anyone who likes it.
This behavior is attributed to socialization. That is, the younger a man comes with a dog, the more they deal with him, and of course they are taught for good, the better he can act with other people (even aliens). We don't even think that genetics can contribute to it, and a research has come to the conclusion that the dogs are much nicer, with more than six repetitive or missing genes in their six chromosome pairs. In the case of man, such a disorder may develop, but it is much rarer, called Williams-Beuren syndrome.
The relationship between dog and man's excessive friendship was sought. The more genes I lack from the sixth chomposo pairs of dogs, the more friendly they are, but it is hard to concentrate on the task. They spend much more time on the alien than on the job.
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(Source: homeowner.com): flickr.com (Images are illustrations)