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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.

Symptoms of a female dog in heat - PET-happy.com

www.pet-happy.com/symptoms-of-a-female-dog-in-heat/

Sep 6, 2013 ... Symptoms of dogs in heat vary throughout the cycle, and recognizing them is crucial if you are an owner of an un-spayed female dog.

Symptoms of a Dog in Heat - Dogs - LoveToKnow

dogs.lovetoknow.com/wiki/Dog_Heat_Symptoms

If you own an unspayed female, knowing the symptoms of a dog in heat can be very important to managing her reproductive cycle. Learning the stages of the ...

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

pets.webmd.com/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 ...

A Guide to Dog Heat Symptoms - Vetinfo.com

www.vetinfo.com/dog-heat-symptoms.html

The first week of your female dog's heat cycle is known as proestrus. This period lasts from seven to ten days, with most dogs experiencing this stage of the heat ...

Dog Reproduction, A Dog's Heat Cycle

www.dogbreedinfo.com/breedingheat.htm

Dog Reproduction (The Heat Cycle). Signs of Heat. The first sign of a female ( dam) coming "into season" is often swelling of the vulva. This swelling can occur a ...

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 preparing for mating and possibility of producing a litter. We tell you what ...

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 ... When does a female dog have her first estrus cycle? Dogs will have their first estrus ... What are the signs of estrus? The earliest sign of ...

www.ask.com/youtube?q=Signs of Female Dog Heat Cycles&v=hCE12GcymPc
Jun 25, 2009 ... Dog Heat Symptoms- http://healthydogforlife.com "symptoms of dog in heat" " signs of dog in heat" "dog in heat cycle" "signs your dog is in heat" ...

Is my Dog in Heat - Banfield Pet Hospital®

www.banfield.com/pet-healthcare/additional-resources/article-library/conditions-illnesses/is-my-dog-in-heat

Learn about female dog reproductive cycles from the pet health experts at Banfield Pet ... there are noticeable signs that can alert you that your dog is in heat:.