The gestation in a dog has a duration which is close to 64 days, and which consists of two phases: The first phase of pregnancy: Until the 43rd day, it concerns the development of the embryo. First Stage of Dog Labor (Cervical dilation) The first stage of dog labor takes place when the dog’s first contractions take place. The 3 stages of dog labor. All dogs, regardless of breed, pass through various stages as they grow and develop, physically, mentally, and psychologically. Female dogs usually experience their first heat cycle at about the age of 6 months, although that initial estrous cycle often occurs considerably later in certain breeds. If not spayed, the dog goes into heat an average of twice annually. The Diestrus Stage — Pregnancy (or not) This third stage is the period following mating, it commonly lasts 58 to 63 days in a pregnant female and 60 to 90 days in a non-pregnant female. The 4 week pregnant dog: days 21 – 27. Let’s rejoin our unborn puppies four weeks after fertilization. During this stage, the dog’s cervix opens and her reproductive tract starts relaxing. They’ve anchored to the lining of the uterus, and the placenta now delivers nutrients from mum to pup. One general rule that Doberman owners use to remember the growth rate of the average Doberman is “ten pounds every month.” That means they should weigh 20 pounds at two months of age, 30 pounds at three months of age, 40 pounds at four months, and so on. A dog's cycle consists of four distinct stages, but she can only get pregnant during the estrus period. Household supplies that you should have on hand — in case you need to assist with the puppies’ birth. Psychologists use the term critical period to describe a specific time in a dog’s life when certain experiences have a lasting effect upon their psychological development. Progesterone is dominating and the female will refuse a male’s advances during this stage. No weight gain is usually seen in the dog during this stage. Characteristics of pregnancy in dogs. Stage 3: In the final phase of the pregnancy, the puppies continue their development safely within the womb. Stage 1: Contractions begin, and the cervix becomes dilated and softened. The stages of dog pregnancy. The heat cycle in dogs, also known as estrus is the time female dogs can mate and get pregnant.The very first heat cycle typically occurs when the female dog reaches sexual maturity, approximately at 6 to 12 months old. The fourth week of foetal development is considered to be one of the most formative stages of the pregnancy, when the growing puppies are most vulnerable to damage and developing defects. Stages and Dog Pregnancy Timeline Month 1: Dog Fetus: Days 1 through 4: Pregnancy starts when the dog ovulates, which is called the data of whelping. Dog sperm will reach an ovum on day 4 (48 to 73 hours). Stages Of A Dog Giving Birth . 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