(2) does not seem very natural to me. (1) seems more natural English but slightly vague about the reason for what is being described. (3) is natural, and, unlike the other two, is specific about the cause of death.
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Anonymous But what if their master has died, and want to die themselves. to curl up and die doesn't convey duration or does it GPY?It doesn't particularly convey a long duration, but long enough for a weak or sad cat to die.
AnonymousTo you, how long a duration does it convey?I really couldn't put an exact time on it. It's just an expression.