What are the early signs of pregnancy in a dog?

The early signs of dog pregnancy are not obvious; clear symptoms usually appear after about 3 weeks, such as the dog becoming restless, with pregnancy reactions like vomiting, sleepiness, and poor appetite. Later the breasts and belly gradually enlarge, nipples rise and turn pink. To confirm pregnancy, the owner can take the dog to a veterinary hospital for an ultrasound a month after mating. Once pregnancy is confirmed, adjust the diet promptly and add more nutrition.