Prosestrus Stage (6-11 Days)
Vulvar swelling and bleeding (6-11 days)
Your dog will be attractive to males but not receptive to them
This phase is over when your pet becomes receptive to males and will stand to be bred
Estrus Stage (“Fertile” Phase – 5-9 days)
Discharge is straw-colored to light pink
Softer, yet still swollen vulva
This phase is over when your dog is no longer accepting of the male
Diestrus Stage (56-60 days)
A non-receptive time when the corpora lutea, which produce progesterone, are active on the ovary and anestrus.
Anestrus (variable time frame, several months long)
No ovarian activity.
Most dogs cycle about twice a year.
*This information came from the following website: http://www.pets.ca/articles/article-dogpregnant.htm
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{ 2 comments… read them below or add one }
Does a Boston Terrier’s nipples enlarge during the heat cycle? Does the vulva swelling go down if she is pregnant?
My Boston terrior is just six months old & she got her period …she has had it for 2 weeks and her Vulva area is sooooo swollen, it’s really big! She hates wearing the dog diaper…when will it go away? it seems like it’s never ending and when can I get her fixed? Thank you ..J