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For small breeds, female puppies can come into heat at 5-6months, and, if bred, can have a litter at 7-8months.

Most breeds over 35lbs at adult weight do not come into heat till 7-9months, some later.

However, do not allow puppies to breed this young.

Sibling puppies WILL mate as soon as they have a chance.

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16y ago

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