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.
It uses sound waves to create an image of your dog's womb. The vet may give your dog a blood test to check her hormone levels. Dogs have higher levels of a hormone called relaxin when they're pregnant. If you don't take your dog to the vet until her 4th week of pregnancy, the doctor can feel your dog's belly to confirm puppies are on the way. This method can only be used between the 28th and 35th days of pregnancy, and it should be done by someone who is trained.