TL;DR: False pregnancy is a common, non-emergency hormonal condition in dogs that usually resolves on its own, though you should consult a vet if mammary glands become painful or the dog appears ill.
What exactly is a false pregnancy in dogs and what causes it?
False pregnancy, or pseudopregnancy, is a common condition where a female dog displays symptoms of pregnancy and mothering without actually carrying puppies. This typically occurs four to nine weeks after a heat cycle and is caused by a hormonal imbalance—specifically a drop in progesterone and an increase in prolactin. This hormonal shift tricks the body into thinking it needs to prepare for nursing, leading to physical changes like mammary gland enlargement and milk production.
When is a false pregnancy considered a medical emergency for my dog?
- The urgency level for a false pregnancy is low, as symptoms are typically self-limiting and resolve within two to three weeks.
- While uncomfortable, it is rarely a medical emergency unless secondary complications arise.
- Contact a veterinarian if your dog becomes lethargic or loses her appetite.
- Seek medical attention if the mammary glands become hot, painful, or hard, as these can be signs of an infection like mastitis.
How does providing a photo help the triage process for my dog?
- A clear photo of the mammary glands and any discharge allows a triage assistant to assess the color and degree of swelling.
- Visuals help professionals look for signs of inflammation or skin irritation.
- Photos help differentiate between a normal hormonal response and a potential infection.
- Providing visual evidence ensures your dog receives the most appropriate care plan without unnecessary delay.
Clinical Context (Merck Veterinary Manual)
False pregnancy in bitches is characterized by mammary gland hyperplasia, lactation, and behavioral changes that occur at the end of diestrus. Rule out true pregnancy via history, abdominal palpation, radiographs, and ultrasonography. Do not milk out the mammary glands as this stimulates lactogenesis; alternating cold and warm compresses or wrapping the abdomen may provide relief from discomfort secondary to mammary gland enlargement. Tranquilizers such as diazepam (up to 4 days) may be considered for significant behavioral changes. Estrogens should be avoided due to the risk of bone marrow suppression. Megestrol acetate (2.5 mg/kg/day, PO, for 8 days) is approved for treatment in the USA, but prolonged or repeated use may cause pyometra. Androgens such as mibolerone (16 mcg/kg/day, PO, for 5 days) may decrease clinical signs, but it is not approved for this use in the USA. If pseudopregnancy is recurrent and distressing to the owners, breeding or ovariohysterectomy should be considered.
Chapter: Reproduction
Source: The Merck Veterinary Manual, 11th Edition (Page 1395)