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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.

How Long Does a Dog Stay in Heat? - American Kennel Club

www.akc.org/content/dog-care/articles/how-long-are-dogs-in-heat/

Jul 30, 2015 ... There's a relatively small window when your dog is most fertile during the heat cycle; it may begin about nine or ten days after she goes into ...

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

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

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 ...

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

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

There are four stages to the canine estrus cycle: Proestrus: vaginal discharge, males attracted to females, females unwilling to mate. Length: 4-20 days. Estrus:  ...

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 ...

Understanding The Dog Heat Cycle Stages & Signs

breedingbusiness.com/stages-of-the-dog-heat-cycle/

Sep 18, 2015 ... When a female comes into her dog heat cycle, or season, her body is ... from 5 to 21 days each, the length varies greatly between individuals.

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

www.petwave.com/Dogs/Basics/Breeding/Heat.aspx

Jul 16, 2015 ... Instead, their heat cycles gradually stretch out in length. A dog's heat cycle consists of four stages: proestrus, estrus, diestrus and anestrus.

Estrus Cycles in Dogs | VCA Animal Hospital

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

May 16, 2011 ... Dogs will have their first estrus cycle when they reach puberty. Estrus is the stage of the reproductive cycle in which the dog can become ...

How Long Does a Dog Stay In Heat? -

dogsonlinehelp.com/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 ...

Understanding the Heat Cycle of Female Dogs - LoveToKnow

dogs.lovetoknow.com/wiki/Female_Dog_Heat_Cycle

Understanding a female's heat cycle can help you prepare for a breeding or prevent an unwanted litter. Find out how the cycle works and how to spot when a  ...