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.
This will be an important step so that you know all puppies have been pushed out. From time of conception to date of giving birth, your Chihuahua will be pregnant for 9 weeks (63 days). This, of course, is not a lot of time. At the first signs of pregnancy with your dog, you should bring her to the vet.