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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 a Dog Stay in Heat? - American Kennel Club


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


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


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


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 ...

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


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


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

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


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