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  2. Dog breeding - Wikipedia

    en.wikipedia.org/wiki/Dog_breeding

    Dogs reach puberty between 6 and 24 months old, at which age female dogs will start having an estrous cycle. There are four stages of estrous: proestrus, estrus, diestrus, and anestrus. A dog in estrus, also known as being "in heat", can become pregnant during this 3- to 21-day period. [3]

  3. Canine reproduction - Wikipedia

    en.wikipedia.org/wiki/Canine_reproduction

    In domestic dogs, sexual maturity occurs between the ages of 6 and 12 months for both males and females, although this can be delayed until up to two years of age for some large breeds. [2] Pregnancy is possible as soon as the first estrus cycle, but breeding is not recommended prior to the second cycle. [3]

  4. Estrous cycle - Wikipedia

    en.wikipedia.org/wiki/Estrous_cycle

    A female dog is usually diestrous (goes into heat typically twice per year), although some breeds typically have one or three cycles per year. The proestrus is relatively long at 5 to 9 days, while the estrus may last 4 to 13 days, with a diestrus of 60 days followed by about 90 to 150 days of anestrus.

  5. Dog - Wikipedia

    en.wikipedia.org/wiki/Dog

    In domestic dogs, sexual maturity happens around six months to one year for both males and females, although this can be delayed until up to two years of age for some large breeds. This is the time at which female dogs will have their first estrous cycle, characterized by their vulvas swelling and producing discharges, usually lasting between 4 ...

  6. Vaginal cytology - Wikipedia

    en.wikipedia.org/wiki/Vaginal_cytology

    Vaginal cytology is a microscopic examination of cells from the vaginal epithelium.In veterinary medicine, it helps differentiate the stages of the mammalian estrous cycle because the vaginal epithelium changes in response to sex hormone levels; practically, it is used to distinguish when a female canine is at a particular point in the estrous cycle. [1]

  7. Siberian Husky - Wikipedia

    en.wikipedia.org/wiki/Siberian_Husky

    Sable female Siberian Husky. A Siberian Husky has a double coat that is thicker than that of most other dog breeds. [12] It has two layers: a dense, finely wavy undercoat and a longer topcoat of thicker, straight guard hairs. [13] It protects the dogs effectively against harsh Arctic winters, and also reflects heat in the summer.

  8. Seasonal breeder - Wikipedia

    en.wikipedia.org/wiki/Seasonal_breeder

    Female seasonal breeders will have one or more estrus cycles only when she is "in season" or fertile and receptive to mating. At other times of the year, they will be anestrus, or have a dearth of their sexual cycle. Unlike reproductive cyclicity, seasonality is described in both males and females.

  9. Dog behavior - Wikipedia

    en.wikipedia.org/wiki/Dog_behavior

    For several days before estrus, a phase called proestrus, the female dog may show greater interest in male dogs and "flirt" with them (proceptive behavior). There is progressive vulval swelling and some bleeding. If males try to mount a female dog during proestrus, she may avoid mating by sitting down or turning round and growling or snapping.