With a population of about 100 million people, the Philippines is the seventh-most populated country in Asia and the 12th most populated country in the world. An additional 12 million Filipinos live overseas, comprising one of the world's largest diasporas.
The Reproductive Cycle in Dogs. In order to answer the question, how long are dogs pregnant, you first need to understand the dog reproductive cycle. Intact female dogs go into heat approximately every six months, although this can vary depending on the dog and the breed. The heat cycle lasts 18-to-21 days and is broken into four distinct stages.
Remember that the first stage in the pregnancy of your dog will be the gestation. There are no clear symptoms to diagnose pregnancy in dog right after it happens. Thus, a dog is likely to show signs of pregnancy only after the first 25 to 36 days since mating.