Because humans have bred them that way. We don’t know exactly when dogs were domesticated by humans; we know that it happened at least 14,000 years ago, and some potential evidence showing over 30,000 years ago. Regardless, we have had dogs for millennia, since before we had written language. We have selected the attributes in dogs that are most compatible with us, like loyalty and affection, and have weaned out less desirable attributes. Sometimes this was deliberate, with dog breeders creating new breeds or specifically cultivating certain qualities. But a lot of this was humans just choosing dogs that were loyal and pleasant to be around. Dogs that are loyal and affectionate tend to be cared for by humans more, meaning they survive and have puppies, and that quality gets passed on.
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