If your boy dog goes on top of the girl dog does that mean the girl dog will get pregnant or do the HAVE to be butt to butt?

They actually have to "tie". Which means complete intercourse. His penis will swell inside the female like a ballon. Until this balloon is completely empty they will be stuck together. After the tie, the male will usually jump down and turn around, which is why they're butt to butt. They will remain stuck for 10-15 minutes. Hope this helps.

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