Some people rear pet animals Dog

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In India some people rear pet animals as dog. They feed them well and take all care including medical. Some rear for prestigious, some rear to safe guard their belongings,some with true love. But, in the course of rearing , when the dog become sick or no more needed, they take the dog out to far away distance ares and they leave it as street dogs and run away from the dog.Till that time the dog was fed well.Is it not unfair?. Is it the reward for the truthfulness of the dog? I need Mylotters to air their views.