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  2. 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.

  3. Canine reproduction - Wikipedia

    en.wikipedia.org/wiki/Canine_reproduction

    During proestrus and estrus, females may have a clear, blood tinged, or bloody discharge. Dogs during these stages are often informally referred to as being in heat. The length of these cycles varies greatly among breeds and even between individuals of the same breed. Proestrus and estrus can last anywhere from 5 days to 21 days. [5] 3.

  4. Dog - Wikipedia

    en.wikipedia.org/wiki/Dog

    The dog (Canis familiaris or ... This is the time at which female dogs will have their first estrous cycle, ... with an average of 63 days, although the length of ...

  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. Long Haired Dachshund's 'Phantom Pregnancy' Tugs at People's ...

    www.aol.com/long-haired-dachshunds-phantom...

    Depending on the breed, dogs go into heat 1-3 times per year. Purina explains why Mia may be so attached to her toy. Mild symptoms of mothering can usually be managed by removing toys she is ...

  7. Rut (mammalian reproduction) - Wikipedia

    en.wikipedia.org/wiki/Rut_(mammalian_reproduction)

    The second breeding phase of the rut takes place three to four weeks after the first breeding phase. This is due to younger cows coming into estrus, as well as older cows that were not bred on their first estrus cycle coming back into estrus. Herd bulls are less aggressive towards satellite bulls at this phase in the rut due to exhaustion. [13]

  8. List of mammalian gestation durations - Wikipedia

    en.wikipedia.org/wiki/List_of_mammalian...

    Canid (Domestic dog) (Canis familiaris) 58 65 61 ... There is a positive relationship between mass at birth and length of gestation in eutherian mammals. [31]

  9. Dog behavior - Wikipedia

    en.wikipedia.org/wiki/Dog_behavior

    Female dogs have their first estrus ("heat") at 6 to 12 months-of-age; smaller dogs tend to come into heat earlier whereas larger dogs take longer to mature. Female dogs have an estrous cycle that is nonseasonal and monestrus, i.e. there is only one estrus per estrous cycle.