Most owners of animals will want to take care of their pets until the animal is in obvious pain, discomfort, too sick and suffering to carry on living. While some animals will go away to die, usually when they have become old, however, like humans, animals don't just decide to die, vital body organs need to shut down first which, as in humans, can take a long time, but we don't put an animal on a morphine drip to keep it alive until death eventually occurs. Any respectable vet will also not put an animal to sleep unless it is really necessary for the animal to be out of pain.
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