<\/span><\/h2>\nFor a better understanding of the changes, signs, and behaviors of the female dog in heat, it is worth taking a look at the different phases that make up a canine reproductive cycle.<\/p>\n
Proestrus (preparation)<\/strong>. It is the first stage of the reproductive cycle and lasts approximately 9 days. Its beginning is marked by the maturation of the ovules and the increase in estrogen levels. Typical symptoms include bloody discharge and swelling of the vulva. Although the female may start to attract males during this phase, more often than not she will reject them until she reaches the next stage.<\/p>\nEstrus (mating)<\/strong>. The second phase also usually lasts about 9 days, but can range from 4 to 21 days in total. This is the stage in which the bitch becomes more fertile and receptive to the male. Eggs are released from the ovaries, estrogen levels drop, and progesterone levels begin to rise. Signs of estrus include decreased bloody discharge and enlargement and tenderness of the vulva.<\/p>\nTogether, the phases of proestrus and estrus form the heat period.<\/p><\/blockquote>\n
Right-handed<\/strong>. It is the final phase of heat in female dogs. The discharge is completely reduced and the vulva returns to normal. The female will no longer be receptive to males during this stage. Under normal conditions, diestrus usually lasts 60 to 90 days, but it lasts 58 to 63 days if the bitch is pregnant.<\/p>\nAnestrus<\/strong>. Finally, anestrus is the time interval that elapses between one heat and another. It usually lasts between 4 and 6 months, although it can last much longer.<\/p>\n