Yes, premature animals exist, though can only occur in special conditions and carry greatly increased health risks. They are prone to heart failure, dental problems, behavioral/temperamental problems and various other complications, many of which are causes of their relatively short lifespans.
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Premature births tend to die in nature, as they don't generally have ridiculously high tech and expensive intensive care wards available.
Yes, premature animals exist, though can only occur in special conditions and carry greatly increased health risks. They are prone to heart failure, dental problems, behavioral/temperamental problems and various other complications, many of which are causes of their relatively short lifespans.