How Long Cat on Heat

How Long Cat on Heat

Are you wondering how long a cat will be on heat? You may have noticed signs of pregnancy or pseudo pregnancy in your cat. She may have an increased appetite and may even produce milk. Depending on the situation, your cat may come back into heat as early as 4-6 weeks after being out of heat or as late as one or two days. This cycle will repeat until she mates. She may even come into heat more than once.


The duration of anestrus varies, but for bitches it is nine days, while for ovaries the period is three to 18 days. In mammals, estrus lasts two to ten days and is usually preceded by ovulation, whereas in quadrupeds, the estrus lasts four to eight days. However, it is important to note that not all bitches will stand for males during this time. A normal bitch may stand for males as early as 11 days prior to ovulation, and 8 days after ovulation.

Regardless of how long a mare stays on heat, it is important to note that estrus is not permanent. Although some mares will cycle without pregnancy, they will ovulate at a later date. Therefore, managers should maintain detailed records and calculate the appropriate breeding time. Most managers breed their mares on the second or third day of estrus, and every other day until they fall out of estrus. In some cases, palpation and ultrasonography can help them determine the appropriate breeding time.

The age of puberty in bitches varies from six to fourteen months. The first estrus can be very long or split. In the case of a young bitch, it is important to avoid putting her with a mature cycling bitch, as she will reach puberty sooner. Also, some small breeds reach puberty earlier. A young bitch will likely be on heat sooner if housed with a mature cycling bitch.


The estrous cycle in a female dog is a complex one, and it varies widely by breed and individual dog. A female dog goes through four different phases during her lifetime: proestrus, estrus, metestrus, and anestrus. A female dog will be in heat for approximately five to thirteen days each time. In between estrus periods, the dog is inactive and can go months without going into heat.

The first phase of the estrous cycle is known as the proestrus and lasts approximately nine days, although it can be as short as two or three days. Proestrus is a period of growing follicles, releasing luteinizing hormone (LH), and attracting males. Once the cycle enters the estrus phase, the body releases the hormones oestradiol (E2) and LH, leading to a change in the vaginal epithelium and a blood-tinged discharge. While the proestrus bleeding is serosanguinous, it is now transparent and is commonly called the heat.

Once the luteal phase is complete, the ovarian function reverts to its pre-pregnancy state. A woman’s ovary produces progesterone and estrogen, both of which are essential for reproduction. A female will be in proestrus for seven to ten days before ovulation. If her ovarian function is normal, the newborn foster young will be developed normally.