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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.

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

Sep 6, 2013 ... In this article you are going to learn how to identify symptoms of a female dog in heat, depending on the stage of the heat your dog is in.

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 ...

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 ...

www.thespruce.com/signs-your-dog-is-in-heat-3385379

Apr 4, 2017 ... If your female dog has not been spayed, it is good to be familiar with these common signs of estrus or also known as "heat" in dogs.

www.wikihow.com/Tell-if-Your-Dog-Is-in-Heat

Jan 3, 2017 ... Female dogs, will generally go into heat during puberty, at around 6 to .... Ask yourself whether the symptoms you are seeing could be heat or if ...

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 ...

www.canidae.com/blog/2010/07/how-to-care-for-female-dog-in-heat

Jul 8, 2010 ... Female dogs that are not spayed go into season or into heat ... These are just some of the symptoms of her being in heat, and if she isn't ...

www.petcha.com/what-to-expect-with-a-young-dog-in-heat

Hmmm. Your male dog seems to be sniffing your female puppy quite a bit. She is just 6 months old, but an alarm bell goes off. Maybe she is in heat. A quick ...

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

When your female dog is receptive to mating, she is in a stage of her reproductive cycle known as being in “heat.” You can expect this to happen about twice a ...