From what day is pregnancy considered in dogs? - briefly
Pregnancy in dogs is typically considered from the first day of ovulation, which usually occurs around day 10-14 of the estrous cycle.
From what day is pregnancy considered in dogs? - in detail
In canine reproduction, the determination of pregnancy onset is crucial for effective management and care. Pregnancy in dogs is typically counted from the first day of vaginal discharge, which marks the beginning of proestrus. This stage lasts approximately nine days and is characterized by increased estrogen levels, leading to behavioral changes and swelling of the vulva.
The onset of pregnancy is considered from the second day of standing heat, or estrus, which usually occurs around day 10-12 of the cycle. During this phase, which lasts about nine days, the dog is receptive to mating and ovulation typically takes place between days 10-14. It is important to note that successful fertilization can occur up to four or five days after ovulation, as sperm can remain viable within the female's reproductive tract for an extended period.
After successful mating, hormonal changes begin to take place in the bitch's body, with progesterone levels rising steadily from around day 25-30 of pregnancy. This increase in progesterone helps maintain the pregnancy and stimulates the development of the placenta. Pregnancy can be confirmed through various methods such as ultrasound or hormonal testing, typically performed between days 28-35 after mating.
In summary, while the exact onset of pregnancy in dogs is challenging to pinpoint due to the complex interplay of hormones and reproductive processes, it is generally considered from the second day of standing heat. Understanding this timeline is essential for veterinary professionals and dog owners alike, ensuring optimal care and management throughout the gestation period.