Proestrus: This is what we generally recognise as a dog being in heat with the most physical symptoms. During this period, their body will start to prepare for mating and pregnancy. This is also when their body will begin to release an egg, and you will notice their vulva swelling along with some bleeding. Behavioural signs include your pooch becoming more clingy and affectionate or irritable and distant, it all depends on how they react to hormones. This stage will usually last around a week, but it can vary anywhere between three days to two weeks. At this point, they’re not ready to mate, but their body is getting ready. Â
Estrus: This is the next stage of the heat cycle when your pup becomes fertile and able to breed. Her estrogen levels will reduce, and progesterone will increase. This starts to prepare her body for a possible pregnancy, and when you will have to be extra careful if you don’t want her to have puppies. Her bleeding may reduce, and swelling may decrease a little but don’t be fooled into thinking you can let your guard down. During the estrus cycle, it’s important to keep your canine companion under a watchful eye. Male dogs will have a lot of interest in her, and you may need to adjust your walks to keep her a little more isolated. This stage can last anywhere from three to twenty one days. Â
Diestrus: Regardless of whether your pooch is pregnant or not, her body will behave as if she is pregnant because of the hormones she is producing. Male dogs will take less interest in her at this point, and her bleeding should come to a stop. You could notice some symptoms of a phantom pregnancy even if she isn’t pregnant, but she will gradually go back to normal behaviour if her hormones start returning to normal and she isn’t pregnant. This usually lasts about ten days or so. Â
Anestrust: This is what you may consider the normal period of your pup’s cycle when their behaviour goes back to how normal and their hormones balance out. For about six months you won’t have to worry about her getting pregnant until the cycle goes first circle and she gradually becomes fertile again. Â
Swollen vulvaÂ
Bloody discharge from the vulvaÂ
More frequent urinationÂ
More active and restlessÂ
Sleeping moreÂ
Mounting and humping Â
Attention from male dogs Â
Tail tucking Â
Seeking out more contact from male dogs