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  2. A Comprehensive Guide to Navigating Your Dog’s Pregnancy - AOL

    www.aol.com/comprehensive-guide-navigating-dog...

    The “heat season” begins around 6 months of age, on average, for unspayed female dogs. ... a pregnant dog will gain weight. Female dogs may weigh significantly more than they did at the time ...

  3. 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.

  4. What to Do When Your Dog Is in Heat (Besides Freak Out ... - AOL

    www.aol.com/lifestyle/dog-heat-besides-freak...

    When your dog is in heat, you have two goals: keep her comfortable and prevent her from getting pregnant. Unless you are a licensed breeder who knows what’s up when it comes to caring for a ...

  5. 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]

  6. 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]

  7. Can Dogs Sense Pregnancy? - AOL

    www.aol.com/dogs-sense-pregnancy-130000965.html

    The short answer is: dogs can probably smell pregnancy hormones. There’s no definitive research, but the idea isn’t that far-fetched, given their olfactory talents. We did some research and ...

  8. Pyometra - Wikipedia

    en.wikipedia.org/wiki/Pyometra

    Pyometra is a result of hormonal and structural changes in the uterus lining. This can happen at any age, regardless of how many heat cycles have occurred or previous pregnancies (or lack thereof), although it becomes more common as the dog gets older. The main risk period for a female is for eight weeks after her peak standing heat has ended. [2]

  9. 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]