3 weeks
Rating Newest Oldest. Best Answer: A dogs heat lasts for 3 weeks. Typically the actual bleeding lasts for 1 full week during the 2nd week of the heat cycle. However, a couple days more or less isn't uncommon especially in the first couple cycles. My experience with breeding my dogs is that they usually are in season for 3 weeks with the first week of none to very little blood. The second week they bleed quit a bit more and the 3rd week very little again. If your dog mates..she will do so the second week generally. The average heat cycle for a dog is approximately 3 weeks and since this an an average, some heats are shorter (as little as 7-10 days), others are longer (4 weeks or more). Average times between heat periods is seven months but some dogs can cycle as early as every 4 months, some once a year. Lengths of heat cycles and intervals between cycles are different for each dog but most dogs hit somewhere close to the averages. Proestrus. The first phase of a dog’s heat cycle is proestrus. On average, it lasts about 9 days but can range from 3 to 17 days in length. The dog’s vulva gradually becomes swollen and excretes a reddish-brown discharge.  Timing. Your dog can come into her first heat any time between 6 and 24 months. According to Webvet.com, small dogs come into heat sooner than larger breeds. Typically she will have two estrus cycles, or heats, a year, and each one lasts for between 18 to 24 days. She is likely to show signs that her heat is about to start by changes in her behavior. The first stage is called proestrus. This lasts approximately 10 days and it is during this stage that your dog will bleed from the vaginal area. This is your dog's preparation for pregnancy phase, but she will not want to mate with a male during this time. 1 On average, dogs have two cycles a year. 2  The estrus cycle lasts on average 12-21 days, but maybe be as short as a few days to four weeks. 3  The estrus period length varies widely between breeds and individual dogs. 4  The length of a cycle varies widely, even for dogs of the same breed. 1 The estrus cycle lasts on average 12-21 days, but maybe be as short as a few days to four weeks. 2  The estrus period length varies widely between breeds and individual dogs. 3  The length of a cycle varies widely, even for dogs of the same breed. 4  If in doubt, assume the longer end of the range for the cycle length Bleeding Stage. The estrus cycle has four stages. The first stage is called proestrus. This lasts approximately 10 days and it is during this stage that your dog will bleed from the vaginal area. This is your dog's preparation for pregnancy phase, but she will not want to mate with a male during this time. The female dog menstruation period usually starts when she is 5 to 10 months old; however, in some small breeds, it may start at six months. The female dog menstrual cycle lasts for 21 days or three weeks on an average, but it may vary from 8 to 30 days. 1 The phase typically lasts from 8 to 13 days. 2  Estrus: During this phase, the bleeding normally stops but there could be swelling at the vulva region. 3  There may be a clear or straw-colored discharge, which could last for 4 to 7 days. 4  Metestrus: This phase is known as the false pregnancy phase. Although this can vary with the individual dog, on average a dog will be 'in heat' for 2-3 weeks. The onset of estrus is characterized by swelling of the external vulva. Next, the dog will develop a vaginal discharge. Estrus ends when the discharge completely disappears and the vulva returns to its normal size. Most dogs come into heat twice per year, or about every six months, although the interval can vary between breeds, and from dog to dog. Small breed dogs may cycle three times per year, while giant breed dogs may only cycle once every 12-18 months.
https://answers.yahoo.com/question/index?qid=20060612224917AADVpCu http://www.labradornet.com/heatcycle.html http://www.petwave.com/Dogs/Basics/Breeding/Heat.aspx http://pets.thenest.com/long-bleeding-phase-last-dogs-heat-4132.html http://vetmedicine.about.com/od/pregnancybirthindogs/f/k9_estrus.htm http://pets.thenest.com/long-bleeding-phase-last-dogs-heat-4132.html http://www.pethealthandcare.com/blog/dog-health/female-dog-bleeding.html http://www.vcahospitals.com/main/pet-health-information/article/animal-health/estrus-cycles-in-dogs/5778
how long does a dog bleed during a heat cycle