Male dogs typically don't "cry" during mating in the sense of expressing sadness. Instead, any vocalizations, such as whining or whimpering, are usually a sign of excitement and agitation stemming from the presence of a female dog in heat.
Here's a breakdown:
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Pheromones and Excitement: A female dog in heat releases pheromones, powerful chemical signals that male dogs can detect from great distances. These pheromones trigger a strong instinctive drive to mate. The male's vocalizations are usually expressions of this intense excitement and anticipation.
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Agitation and Restlessness: The male dog may also be feeling agitated and restless if he is kept away from the female. He is experiencing a strong biological urge, and any barrier preventing him from reaching the female can lead to frustration, which may manifest as whining or whimpering.
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Not Necessarily Pain: It's important to emphasize that these vocalizations are not typically expressions of pain or discomfort. The mating process itself can sometimes be a bit rough, but any crying sounds at that point are still more likely related to the intensity of the experience and not necessarily physical harm.
In summary, the "crying" or whining sound a male dog makes when near a female in heat or during mating is usually a sign of intense excitement and anticipation, driven by pheromones and his instinct to reproduce.
