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After the male dog has successfully mounted the female, he will dismount while still being inside of the female and wait for ejaculation to occur.

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The birth rate of females when natural service is 92%, with fresh semen the birth rate is 84% and with frozen semen it is 67%. There was no change in litter size with any of the different insemination ways.

http://onlinelibrary.wiley.com/doi/10.1111/j.1748-5827.1984.tb03429.x/abstract

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There is a wide range of gestation length for canines, 56-70 days, but if the female is bread when there is a LH surge the gestation length is 64-66 days.

http://www.sciencedirect.com/science/article/pii/S019556168650053X

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This is a picture of what it looks like when a male will sniff the female to see if she is in estrus.

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Each estrus cycle lasts around 2-3 weeks. This is the time when she becomes receptive to males. Symptoms include vulva swelling and some bleeding. Female dogs will come into heat cyclically (average 2 heats per year) and are fertile 2-4 times a year.

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Before a female dog's estrus cycle is a phase called proestrus, this phase involves much greater interest in male dogs and the females will "flirt" with the males.

https://en.wikipedia.org/wiki/Dog_behavior#Reproduction_behavior

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Males will sniff a female's vulva when interested in a female. If the female in not interested she will sit, lay or walk away from the male.

https://en.wikipedia.org/wiki/Canine_reproduction

pg. 135- Female Mate Preferences, Principles & Applications of Domestic Animal Behavior

# data[].attributes.attachment_link.description
Animals are multicellular, eukaryotic organisms of the kingdom Animalia or Metazoa. Their body plan eventually becomes fixed as they develop, although some undergo a process of metamorphosis later on in their lives. Most animals are motile, meaning they can move spontaneously and independently. All animals must ingest other organisms or their products for sustenance (see Heterotroph).

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Around 5 months of age is when young male dogs first hit a testosterone level rise and mounting behavior has become apparent. 7 months, they become to seek out a bitch as a mate and are attracted to the ones in heat which put off a pheromone and the males recognizes it.

http://www.petplace.com/article/dogs/behavior-training/normal-behavior/sexual-behavior-in-dogs

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Female dogs first estrus (heat) is caused by a wave of follicles and rise in blood estrogen level. Bitches first heat can occur within 6-12 months of age.

http://www.petplace.com/article/dogs/behavior-training/normal-behavior/sexual-behavior-in-dogs