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Here is an image example of a male smelling a females urine to see if she is close to being in heat or not.

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Females will be ready to breed when they are 6 - 12 months old. Males are ready around 7 months to start finding a mate.
(Source: http://www.petplace.com/article/dogs/behavior-training/normal-behavior/sexual-behavior-in-dogs

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Can take anywhere from 20-30 minutes.  This all depends when the bulbus glands shrink is when compilation will be finished.
(Source: http://www.petplace.com/article/dogs/behavior-training/normal-behavior/sexual-behavior-in-dogs)

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The female will turn down the male many times before allowing him to mount her. This picture shows that flirtation stage.

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This is an image of a male testing to see if the female is in heat

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Even if the dog has been spayed this doesn't mean that the hormone signals are not being sent just like in castration. It depends on the dog and the situation.
(Source: http://www.sciencedirect.com/science/article/pii/S0168159196011331)

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Even if the dog is castrated there is a chance he will still show signs of sexual behaviors and mounting
(Source: http://psycnet.apa.org/psycinfo/1969-03516-001)

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Males will become very aggressive towards male when trying to win over a female
(source: http://www.animalbehaviorassociates.com/pdf/RMN_courtship_mating.pdf)

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During mating when the penis is inserted into the vagina the vagina contracts tightening around the penis making the two inseparable until mating is finished
(Source: http://www.petplace.com/article/dogs/behavior-training/normal-behavior/sexual-behavior-in-dogs

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This video shows the female proceptive behavior before she allows the male to fully mount her

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✔ Dog Mating For The First Time I Dog Mating Stuck Together

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Males can seek out a mate by finding high methyl PHBA in the females urine and vaginal secretion
(Source: http://www.petplace.com/article/dogs/behavior-training/normal-behavior/sexual-behavior-in-dogs)

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Female flirtation behavior which includes snipping, growling, and not letting the males mount.
(Source: http://www.petplace.com/article/dogs/behavior-training/normal-behavior/sexual-behavior-in-dogs

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Dogs and Bitches have different sexual time periods
(Source:http://www.petplace.com/article/dogs/behavior-training/normal-behavior/sexual-behavior-in-dogs)

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Males (dogs) engage in sexual 'play' at the earliest age of 5 weeks, this includes mounting
(Source: http://www.petplace.com/article/dogs/behavior-training/normal-behavior/sexual-behavior-in-dogs