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Canine reproduction

en.wikipedia.org/wiki/Canine_reproduction

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/content/dog-care/articles/how-long-are-dogs-in-heat/

Jul 30, 2015 ... From about six months old to through the rest of her life, a female dog will experience estrus, or heat, roughly every six months. This is the ...

Understanding the Heat Cycle of Female Dogs - LoveToKnow

dogs.lovetoknow.com/wiki/Female_Dog_Heat_Cycle

Oct 15, 2011 ... 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 ...

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 ...

The 4 Stages of the Dog Heat Cycle (Signs Your Dog Is In Heat ...

www.askabreeder.com/Dog_Heat_Signs_and_Symptoms

... dog heat cycle. Discusses the signs of heat you should be watching for to tell if your dog is in heat. ... They can smell your female's heat cycle. You may notice ...

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

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

Non-spayed female dogs will go into "heat" or estrus usually twice a year. The age at which they start their cycles and the duration of the cycle varies greatly ...

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

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

If you have a female puppy, you'll need to be prepared for her estrus cycle. It is similar to a woman's menstrual cycle except that it only happens twice a year.

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 ...

The Dog's Heat Cycle Explained | PetHelpful

pethelpful.com/dogs/-The-Dogs-Heat-Cycle-Explained

Aug 25, 2016 ... In this case, the dog's heat is interrupted and then continued at a later time. Basically a female dog will exhibit signs of pro-estrus with the ...

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.

Answer
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.
More Info

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

www.vcahospitals.com

When does a female dog have her first estrus cycle? Dogs will have their first estrus cycle when they reach puberty. Estrus is the stage of the reproductive cycle ...

Dog Reproduction, A Dog's Heat Cycle

www.dogbreedinfo.com

Dog Reproduction, The Heat Cycle, Signs of Heat, Whelping and Raising Puppies. ... A female should NEVER be bred on her first heat (she has immature eggs) ...

Understanding The Dog Heat Cycle Stages & Signs

breedingbusiness.com

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 ...