What does a bitch's loop look like during heat? - briefly
During estrus, a bitch's vulva will swell and appear larger due to increased blood flow. The vaginal discharge may also change color from red or pink to yellowish-green, indicating ovulation is near.
What does a bitch's loop look like during heat? - in detail
During heat, a bitch's vulva undergoes significant changes that are collectively referred to as the "heat cycle" or "estrous cycle." This process is characterized by three primary stages: proestrus, estrus, and diestrus. Each stage presents distinct physical signs, including alterations in the appearance of the bitch's vulva or "loop."
In the initial stage, proestrus, the bitch's vulva swells due to increased blood flow caused by elevated hormone levels, particularly estrogen. The loop appears enlarged and sometimes slightly reddened. During this phase, which typically lasts about 9 days, the bitch may exhibit signs of interest from males but will not accept them.
The second stage, estrus, is marked by the bitch's readiness to mate. Hormonal changes cause the vulva to become more prominent and reddened. The loop appears swollen and often secretes a bloody or straw-colored discharge. This phase usually lasts around 9 days as well, with the peak of fertility occurring approximately 3 to 5 days after the onset of estrus.
The final stage, diestrus, follows estrus and is characterized by a decrease in hormone levels, leading to a reduction in vulvar swelling. The loop returns to its normal size and color, appearing less conspicuous. This phase can last for several months until the bitch enters anestrus, a period of sexual quiescence before the next heat cycle begins.
Throughout these stages, close monitoring of the bitch's vulva provides valuable insights into her reproductive health and the optimal timing for breeding or pregnancy prevention. Understanding the changes in the bitch's loop during heat is essential for effective reproductive management and ensuring the well-being of both the bitch and potential offspring.