Introduction
False pregnancy occurs most commonly in dogs that are not spayed. The symptoms are brought on when your dog goes through estrus (the period of the reproductive cycle known as "heat") and does not breed. The dog shows signs similar to pregnancy such as lactating, morning sickness, appetite fluctuations, weight gain, and nesting. She may also begin to "mother" toys or other items. These signs typically occur about a month of two after the estrus and can last up to three months.
Diagnosing False Pregnancy in Dogs
If there is a chance that your dog could have bred with another dog, your veterinarian will need to run tests to determine if your dog is pregnant or just experiencing a false pregnancy. First your veterinarian will ask for a history of your dog’s heat cycle for the past 2 to 3 months. She will also inquire about the symptoms your dog has been showing. A physical examination of your dog will be performed. Your veterinarian will palpate your dog’s abdomen to check for changes. She will also check for swelling in the mammary glands.
Your veterinarian may choose to take X-rays or order an ultrasound. This can determine if problems with the uterus are causing these signs or if your dog is experiencing an actual pregnancy.
Prognosis
Most false pregnancies will resolve themselves. Only about 10% of false pregnancies will require treatment. Your veterinarian can determine if and what treatment is necessary.