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  2. Dog Pregnancy: How Long Are Dogs Pregnant? - AOL

    www.aol.com/lifestyle/dog-pregnancy-long-dogs...

    Dogs are pregnant for about 63 days or nine weeks, though this may vary by a few days depending on several factors. A veterinarian can run tests to more accurately determine how far along the ...

  3. Canine reproduction - Wikipedia

    en.wikipedia.org/wiki/Canine_reproduction

    Female cycle. The average length of the reproductive cycle for females is 2–4 weeks. Females reach sexual maturity (puberty) between 8 and 18 months of age. There is a tremendous variability in the maturation age between breeds, and even within a breed of dog. [5] 1.

  4. Crown-rump length - Wikipedia

    en.wikipedia.org/wiki/Crown-rump_length

    An ultrasound showing an embryo measured to have a crown-rump length of 1.67 cm and estimated to have a gestational age of 8 weeks and 1 day. Crown-rump length ( CRL) is the measurement of the length of human embryos and fetuses from the top of the head (crown) to the bottom of the buttocks (rump). It is typically determined from ultrasound ...

  5. Estrous cycle - Wikipedia

    en.wikipedia.org/wiki/Estrous_cycle

    Female dogs bleed during estrus, which usually lasts from 7–13 days, depending on the size and maturity of the dog. Ovulation occurs 24–48 hours after the luteinizing hormone peak, which occurs around the fourth day of estrus; therefore, this is the best time to begin breeding.

  6. Dogs don't actually age 7 times faster than humans, new ... - AOL

    www.aol.com/lifestyle/dogs-dont-actually-age-7...

    The actual formula for calculating a dog's age, it turns out, might mean breaking out your graphing calculator. Dogs don't actually age 7 times faster than humans, new study shows Skip to main content

  7. Pregnancy - Wikipedia

    en.wikipedia.org/wiki/Pregnancy

    Pregnancy is the time during which one or more offspring develops inside a woman's uterus (womb). A multiple pregnancy involves more than one offspring, such as with twins. Pregnancy usually occurs by sexual intercourse, but can also occur through assisted reproductive technology procedures.

  8. Gestational age - Wikipedia

    en.wikipedia.org/wiki/Gestational_age

    Gestational age. In obstetrics, gestational age is a measure of the age of a pregnancy taken from the beginning of the woman's last menstrual period (LMP), [1] or the corresponding age of the gestation as estimated by a more accurate method, if available. Such methods include adding 14 days to a known duration since fertilization (as is ...

  9. Dog breeding - Wikipedia

    en.wikipedia.org/wiki/Dog_breeding

    Dog breeding is the practice of mating selected dogs with the intention of maintaining or producing specific qualities and characteristics. When dogs reproduce without such human intervention, their offspring's characteristics are determined by natural selection , while "dog breeding" refers specifically to the artificial selection of dogs, in ...

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