How long after mating does a female dog’s swelling go down?
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Expert Answer
How long a female dog’s swelling lasts after mating depends on when she was mated. The vulva swells during heat and usually subsides 10-15 days later; days 9-11 are the best mating window, and if mated then, the swelling goes down 3-4 days after. Also, to ensure pregnancy, mate again 1-2 days later to improve success.