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A puppy is considered a dog when they reach about 1 year old. They are full grown when they reach about 1 1/2 years. It really depends on the breed. Some breeds take longer to mature
http://answers.ask.com/Science/Nature/when_does_a_...
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There are a variety of reasons that dogs eat their puppies. Sometimes when there is something wrong with the puppies or when the mother isn't ready to have them she will eat them.
http://answers.ask.com/Science/Nature/why_do_dogs_...
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It is not all that common for a dog to kill her puppies. If she does kill her puppies it is because she is too young or immature to be a mother.
http://answers.ask.com/Science/Nature/why_do_dogs_...
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Not all mother dogs will eat their puppies, but the most common reason would be that she is too young or immature to realize what the puppies are.
http://answers.ask.com/Science/Nature/why_mother_d...
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