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A lack of appetite is usually one of the earliest signs that your dog might be pregnant. Not all females go through this doggie version of morning sickness, but a small percentage of dogs will eat less during the first few weeks of gestation and will usually make up for it later in the pregnancy.
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.