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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 between the breeds of dogs and individual dogs. Learn more facts about canine estrus in this FAQ. ... Answer: There are four stages to the canine estrus cycle:
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vetmedicine.about.com/od/pregnancybirthindogs/f/k9_estr...
vetmedicine.about.com/od/pregnancybirthindogs/f/k9_estrus.htm
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If you own more than one dam, they will usually cycle together, One dam in heat, will bring other dams into heat. A Female, should NEVER be bred on her first heat,(she has immature eggs) and preferably not her second either. ... Generally the dog comes into heat, and the experienced breeder notices right away,
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www.dogbreedinfo.com/breedingheat.htm
www.dogbreedinfo.com/breedingheat.htm
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Estrus or Heat cycle; The average heat cycle for a dog is approximately 3 weeks and since this an an average, some heats are shorter (as little as 7-10 days), others are longer (4 weeks or more). Average times between heat periods is seven months but some dogs can cycle as early as every 4 months, some once a year.
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www.vetinfo.com/dencyclopedia/deestrus.html
www.vetinfo.com/dencyclopedia/deestrus.html
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Some dogs have very subtle signs of estrus, or the so-called "silent heat" in which the dog goes into estrus but doesn't show signs of it. This is a variation that is considered to be normal. ... Question: I am a subscriber to your web page, and would like to ask about dog's heat cycle. I have a 5 year old mix breed...
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www.vetinfo.com/dfemale.html
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When should I start my dog on Heartworm Prevention? ... The dog’s estrus cycle is divided up into several stages. The first stage, pro estrus, usually lasts about 9 days. During this time the female’s vulva swells and a discharge may be noted, although the female will not be receptive to the male.
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www.animalcarehospital.com/page8.htm
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Heat - a female dog's estrus cycle usually lasting around 21 days during which time she may be bred. Usually re-occurs approximately every 6 months. Herpes virus - a disease which may affect puppies, often picked up from an infected dam during birth.
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www.rhiannon-cavaliers.com/dogbreedingterms.htm
www.rhiannon-cavaliers.com/dogbreedingterms.htm
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Dog Reproduction; Basics; ... Sexually mature female dogs have an estrus cycle or heat...that period of time when they ovulate, are receptive to male dogs, and can get pregnant...every 4-12 months. The average is every 7 months, but it's quite variable.
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animalpetdoctor.homestead.com/Reproduction.html
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Common Dog Terms Defined ... Heat - a female dog's estrus cycle usually lasting around 21 days during which time she may be bred. Usually re-occurs approximately every 6 months.
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www.mtnvalley.net/glossary.htm
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Estrus: Typically, estrus lasts for about 9 days. ... Diestrus: This is the period where corpora lutea (CL) are present. The CL are fully functional and secrete increased large quantities of progesterone. During this phase of the reproductive cycle, the bitch refuses to accept the sexual advances of the dog.
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www.vet.uga.edu/vpp/clerk/Beimborn/index.php
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