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The symptoms of a dog's first heat are the same as any other heat and include swelling of the vulva and bloody vaginal discharge. Female dogs may urinate more frequently when in heat or develop other behavioral changes. Continue Reading.
A: The usual time for visible heat signs in a dog are 2 -4 weeks. Even if the dog has no vaginal bleeding, it can be in heat. Dogs usually ovulate after the vaginal bleeding stage and that is when they can actually conceive puppies. Non-spayed female dogs will go into âheatâ or estrus usually twice a year.