ANSWERS: 3
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Yes, presuming she is female and has recently mated.
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Highly unlikely. Dogs don't usually begin to reach sexual maturity until after 6 months of age. Are you sure she is only 3 months old? Has she had a heat cycle? Did she mate with a male dog? If she is pregnant, you should put her under a vet's care as this could be a high risk situation for so young a dog.
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Was she getting rather pugnacious with any other dogs in her vicinity?
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