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Non-spayed female dogs will go into "heat" or estrus usually twice a year, starting at 6-12 months of age. There are four stages of the canine estrus cycle: proestrus, estrus, metestrus, anestrus.
During proestrus, there will be vaginal bleeding. During estrus, the vulva will be swollen, vaginal discharge is more yellowish, the female will accept males and conception can occur.

Canine reproduction


edit]. A female dog's vulva in heat. The average length of the reproductive cycle for females is 2–4 weeks. Females reach sexual ...

How Long Does the Bleeding Phase Last in Dogs in Heat? - Pets


Stopping the heat cycle has health benefits for your dog. If you have a female puppy, you'll need to be prepared for her estrus cycle. It is similar to a woman's ...

How Long Does the Heat Cycle Last in the Dog? - Veterinary Medicine


Non-spayed female dogs will go into "heat" or estrus usually twice a year. The age at which they start their cycles and the duration of the cycle varies greatly ...

Is Your Dog in Heat? - Estrous Cycles in Dogs | VCA Animal Hospitals


Estrus Cycles, or a dog's breeding cycle and sexual.

Reproduction in dogs - season, heat, oestrus, pregnancy tests ...


How often do female dogs come into heat? How long does a "heat" cycle or oestrus last? What are the signs of "heat"? How soon after a cycle can she be ...

Estrus or Heat | ASPCA


What Is Estrus? Estrus, or heat, is the stage in a female dog's reproductive cycle during which she becomes receptive to mating with males. At this time, estrogen  ...

How Long Does a Dog Stay In Heat? -


Jan 4, 2014 ... The heat cycle has three distinct stages. They include: ... The vulva will also swell and the dog may urinate more frequently. This stage may last ...

Dog Breeding | A Dog's Menstrual (Heat) Cycle - PetWave


Instead, their heat cycles gradually stretch out in length. A dog's heat cycle consists of four stages: proestrus, estrus, diestrus and anestrus. Different physical and ...

how long do dogs stay in heat? | Yahoo Answers


Best Answer: Dogs are in heat for 21 days. There are three distinct stages of the heat cycle. The first one is the “Proestrus” and it is during this stage the owner ...

Popular Q&A
Q: What is a dogs heat cycle?
A: Virtually all breeds have two oestrus cycles each year. Initially, the vulva swells and within a day there is a clear discharge, which becomes tinged with blood... Read More »
Source: wiki.answers.com
Q: How to Care for Dogs During the Heat Cycle.
A: 1. Spay your dog if you are not planning to breed her. Spaying your dog prevents uterine cancer, pyometra, unplanned pregnancies and numerous other health conce... Read More »
Source: www.ehow.com
Q: How to Stop the Female Dog Heat Cycle.
A: Female dogs go through a reproductive cycle known as a "heat" which normally occurs every 7 to 8 months. During this period, she can become pregnant, so stoppin... Read More »
Source: www.ehow.com
Q: How many heat cycles in dogs?
A: It all depends on the dog and sometimes breed, usually every 6 months to one year, they go into a heat cycle. After the birth of puppies, some bitches go into a... Read More »
Source: wiki.answers.com
Q: What is a dog's heat cycle?
A: The complete cycle takes about 6 months, resulting in 2 estrous periods each year. But Read More »
Source: www.chacha.com