We only have indirect duties to animals  Philosophers such as Immanuel Kant argue that we only have indirect duties towards animals. This means that we may not treat animals in such a manner that our actions are in conflict with our duties towards human beings. A human has no duty towards a dog not to kick it but a human has a duty towards the dog's owner not to damage his property. Pigs and cows are not loved by any human being so we cause no harm when we kill and eat them. Though the farmer may have owned the cow before, the beef becomes our possession when we purchase it. Wild animals are not owned by any human being so we may do to them what we wish.  Some people argue that cruelty towards animals can lead to cruelty towards humans but there is no evidence that people who work in slaughterhouses are more violent towards other people. In fact, there seems little connection at all between how people treat animals and humans. A slave driver may adore and pamper his dog but beat and kill his slaves.  If we have no direct duties to animals how can we grant them legal protection in the form of rights? The law should only prevent us harming animals when that clearly harms other people. For example, by killing a dog we infringe another person's human right to property.