Well, it all depends. It depends on several factors. The negative factors focus mainly on the potential for a dog, like any other animal, to be a source of infections and infestations detrimental to human health.
The positive benefits to human health are perceived to arise from the psychological and emotional aspects of dog ownership. The physical benefits of taking healthy exercise are well recognised.
Overall, the health benefits of dog ownership would seem to outweigh any negative aspects by a considerable margin. Scientists have always shied away from coming down firmly on one side or the other probably due to the paucity of properly controlled research. However scientific opinion does now appear to be swinging towards the positive.
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