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While many females will hold to a fairly steady schedule of coming into season about every six months, it can vary. Some girls will only come into heat once year, while others may even come into season every four months. However, these extra seasons are not always fertile.
Most female dogs will allow breeding around 10 to 16 days after start of the cycle. You should consider your pet to be in heat for 21 days: 7 days coming into heat, 7 days in heat, 7 days going out.Though conception is most likely during the middle 7 days.ost female dogs will allow breeding around 10 to 16 days after start of the cycle. You should consider your pet to be in heat for 21 days: 7 days coming into heat, 7 days in heat, 7 days going out.