Breeding and in Heat

Question
My question is how often does a female dog go into Heat? How long does this last?  

Answer
Hi Cyndi, A dog's heat cycle breaks done into 3 segments basically. The 1st 7-10 days, they tend to bleed heavier and will not accept a male, the 2nd 7-10 day segment their vulva will swell and they will be willing to accept a male. The last segment also will last approx. 7-10 days and they will be going out of heat and not accept a male.  Hope this helps,

Dawn