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Dogs do not menstruate like humans do. Instead, they come into estrus ("come into heat/season") about twice a year, once they have reached sexual maturity. This can sometimes be associated with a small amount of blood from the vulva, but it is not truly a period.

Female puppies can reach sexual maturity potentially as early as six months old, although the first season (which is the closest equivalent to "getting their period") is often at about nine months old. You will notice changes in her behaviour at this time, and will probably see several male admirers following her around!

It is important to ensure that no un-neutered male dog, even her brother or father, gets to spend unsupervised time with her when she is in heat, since all "entire" males will attempt to mate with her at this time. If this happens she will most likely become pregnant and her young body will not cope well with this. It is best not to breed from her until she is at least 2 years old.

If you do not intend to breed from her, talk to your vet as soon as possible about spaying - not only does this prevent the birth of unwanted puppies, it will also reduce her chances of getting some cancers and remove the threat of a life-threatening womb infection, called pyometra.

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15y ago

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