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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

en.wikipedia.org/wiki/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 a Dog Stay in Heat? - American Kennel Club

www.akc.org/learn/dog-health/how-long-are-dogs-in-heat/

Jul 30, 2015 ... Heat usually lasts between 2-4 weeks. Early in the cycle, a female dog may not be receptive to male dogs, although some are receptive through ...

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

pets.thenest.com/long-bleeding-phase-last-dogs-heat-4132.html

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

vetmedicine.about.com/od/pregnancybirthindogs/f/k9_estrus.htm

Answer: There are four stages to the canine estrus cycle: Proestrus: ... The estrus period length varies widely between breeds and individual dogs. The length of ...

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

www.vcahospitals.com/main/pet-health-information/article/animal-health/estrus-cycles-in-dogs/5778

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

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

www.vetwest.com.au/pet-library/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 ...

How Long Does a Dog Stay In Heat? - - Comments

dogsonlinehelp.com/how-long-does-a-dog-stay-in-heat/

Jan 4, 2014 ... Female dogs have a cycle of six months on average meaning they can be in heat twice a year. The heat cycle has three distinct stages.

Dog Reproduction, A Dog's Heat Cycle

www.dogbreedinfo.com/breedingheat.htm

Dog Reproduction, The Heat Cycle, Signs of Heat, Whelping and Raising Puppies.

Dog in Heat (Canine Estrus): Symptoms, and Spaying - Pets - WebMD

pets.webmd.com/dogs/how-tell-if-dogs-heat

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 levels first ...

Popular Q&A
Q: What is the Length of heat cycle in Chihuahua.
A: about 3 to 4 weeks long. Read More »
Source: www.answers.com
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: www.answers.com
Q: How to Stop the Female Dog Heat Cycle.
A: The female dog heat cycle signals when a dog is ready to become pregnant. How frequently the cycles occur and how early depends on many factors. If you want to ... 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 the pet is "in season" for 21 Read More »
Source: www.chacha.com