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dog's menstrual cycle
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can dog's menstruate more than once a year
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quote from the site given below
Bitches first come onto heat from 6 months of age, usually at 9 or 10 months, and even later in large and giant breeds (up to 24 months). They cycle about every 6 - 8 months, although this can be extremely variable.
http://www.petalia.com.au/templates/StoryTemplate_Process.cf m?Story_No=834
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