How often does a dog menstruate? A normal female dog will menstruate twice a year, with some dogs having one in the spring and one in the fall. Usually, menstruation is accompanied by bleeding for about 10 days. The menstrual period overlaps with the estrus period, and breeding can take place in 11 to 13 days. When a dog is in heat, i.e., at the onset of menstruation, there are many noticeable reactions, such as increased arousal, agitation, louder barking, and a tendency to chase and play with the male dog. In addition, the dog’s vaginal area will become swollen and hard, and secrete mucus with blood. The duration of each heat period is about a week to two weeks, if the dog has a reduced appetite, increased urination, do not worry, it is normal.
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