강아지 임신·수유 관련 호르몬 이상 증상과 원인, 진단·치료와 관리 포인트 총정리

Comprehensive Guide to Symptoms, Causes, Diagnosis, Treatment, and Management of Hormonal Imbalances During Pregnancy and Lactation in Dogs

EndocrineDiseasesMeongsiljang Veterinary Advisory Board

Hormonal imbalances during pregnancy and lactation in dogs can lead to various symptoms, including birthing complications, mammary gland abnormalities, and sudden weight changes. Accurate diagnosis and proper management are essential.

What Are Hormonal Imbalances During Pregnancy and Lactation in Dogs?

During pregnancy and lactation, hormonal changes occur in dogs, including fluctuations in progesterone, which can lead to related health issues. - Progesterone deficiency: Progesterone is essential for maintaining pregnancy. Low levels (luteal insufficiency) can result in miscarriage, where the fetus is expelled before full term. - Progesterone and metabolic changes: During pregnancy and the postpartum resting phase, progesterone stimulates the mammary glands to release growth hormone, which may cause insulin resistance and diabetes. - Hypocalcemia during lactation: During whelping and nursing, calcium levels can drop rapidly, leading to postpartum eclampsia (hypocalcemia, also known as milk fever). These complications can lead to miscarriage, dystocia, and metabolic disorders, making early diagnosis and proper management crucial. Accurate identification of the underlying cause and veterinary care are essential.

What Are the Main Causes of Hormonal Imbalances?

There are several causes of hormonal imbalances during pregnancy and lactation in dogs. First, insufficient progesterone, as seen in luteal insufficiency, can make it difficult to maintain the pregnancy, increasing the risk of miscarriage. Second, during pregnancy and the postpartum anestrus period, elevated progesterone can increase growth hormone levels and insulin resistance, potentially leading to diabetes. Third, calcium requirements rise sharply during whelping and lactation, which can result in hypocalcemia (postpartum eclampsia). Fourth, bacterial infections such as those caused by E. coli, as well as traumatic dystocia, are also significant causes of pregnancy complications. Because all these factors can interact, it is important to work with your veterinarian to accurately identify the underlying cause.

Check for Key Symptoms and Signs

The main symptoms of hormonal imbalances during pregnancy and lactation in dogs include the following:

Delayed parturition: If the gestation period exceeds 67 days, frequent veterinary examinations are necessary to check for dystocia.

Reproductive tract symptoms: Abnormal, hemorrhagic, or purulent vulvar discharge may occur.

Anorexia and lethargy: Systemic signs such as decreased appetite, vomiting, lethargy, and depression may appear.

Fever: Fever may develop if an infection is present.

Muscle tremors and convulsions: Tremors and convulsions may occur in lactating hypocalcemia (postpartum eclampsia).

If any of these symptoms appear, consult a veterinarian immediately.

A nursing puppy showing signs of discomfort

Emergency Signs Requiring Immediate Veterinary Care

If labor hasn’t started by day 67 of pregnancy, or if there’s prolonged pain and stalled contractions during delivery, seek veterinary care immediately. Abnormal, bloody, or pus-like vaginal discharge also requires urgent attention. Lethargy, fever, decreased consciousness, tremors, or seizures may indicate life-threatening conditions such as sepsis, kidney failure, or shock, so prompt veterinary evaluation is essential.

Diagnostic Tests for Accurate Diagnosis

Diagnosing hormonal imbalances involves a combination of tests. First, blood tests measure progesterone levels to assess whether the pregnancy is being maintained. Second, relaxin testing confirms pregnancy and helps distinguish it from pseudopregnancy. Third, ultrasound imaging evaluates the condition of the uterus and the health of the fetus. Fourth, complete blood count and biochemistry panels assess for infection (such as elevated white blood cell counts), hypocalcemia, kidney function, and blood glucose levels. We synthesize the results from all these tests to arrive at an accurate diagnosis.

A veterinarian performing an ultrasound examination on a pregnant dog.

Treatment Methods and Step-by-Step Management Strategies

Treatment for hormonal imbalances depends on the underlying cause. First, if uterine inertia causes contractions to stop, oxytocin is administered to stimulate uterine contractions, and a cesarean section may be considered if necessary. Second, in cases of infection or uterine disease, aggressive fluid therapy and antibiotics are used; severe cases may require an ovariohysterectomy. Third, for hypocalcemia during lactation, calcium (such as calcium gluconate) is administered. Fourth, for progesterone-related disorders, progesterone receptor blockers (e.g., aglepristone) may be used. Treatment must be carried out under the continuous supervision of a veterinarian.

A veterinarian administering medication to a puppy

Home Care and Daily Care Tips

Home care for pregnant and nursing puppies is extremely important. - Provide a quiet environment: Minimize noise and external stimuli before and after delivery. - Ensure proper nutrition: Allow free access to the special diet recommended by your veterinarian. - Monitor mammary health: Check the teats daily for swelling or signs of pain. - Track weight: Weigh your dog daily to detect any sudden changes. - Schedule regular veterinary visits: Arrange routine check-ups before and after delivery. All of these care measures lay the foundation for a successful birth and healthy nursing period.

A calm, secure environment where the mother dog can comfortably nurse her puppies.

Breed-Specific Precautions and Prevention of Recurrence

Progesterone-related diabetes or growth hormone abnormalities during pregnancy and the postpartum resting period are more commonly seen in certain breeds. German Shepherds, Karelian Bear Dogs, Miniature Pinschers, Spitz, and Wolf Dogs have been reported to have a predisposition. Pituitary dwarfism has been reported to have a genetic basis in German Shepherds. Dogs that have previously experienced pregnancy complications are at higher risk of recurrence, so it is important to work with your veterinarian to monitor their condition after delivery and allow for adequate recovery time.

Reviewed by a veterinarian

Dr. Tony — Punnawat Phongkittirak

Veterinarian

A veterinarian who majored in veterinary medicine at Khon Kaen University, Thailand, and completed the IVSA program at North Carolina State University in the United States. Drawing on clinical experience at animal hospitals, he works in the pet healthcare field and is dedicated to building a digital care environment that connects pet parents with veterinarians.

Frequently Asked Questions

Can hormonal imbalances during pregnancy prevent delivery?

Pregnancy is maintained by progesterone, and a deficiency in this hormone (luteal insufficiency) can lead to miscarriage, where the fetus is expelled before full term. Additionally, if uterine inertia causes contractions to stop, it can result in dystocia (difficult labor), which may require oxytocin administration or a cesarean section. Please consult your veterinarian immediately.

What should I do if the mammary glands swell during lactation?

If the mammary glands become swollen and hot, it may indicate an infection or inflammation, so it is important to seek immediate veterinary care for appropriate treatment. Additionally, during lactation, calcium levels can drop rapidly, potentially leading to hypocalcemia (postpartum eclampsia). If you notice tremors or seizures, emergency veterinary attention is required.

Can my pet become pregnant again after treatment for a hormonal imbalance?

After sufficient recovery time and passing a veterinary check-up, your pet can become pregnant again. However, if there were pregnancy complications in the past, there is a risk of recurrence, so caution is necessary.

Is it safe to give nutritional supplements during pregnancy?

Veterinarians emphasize the importance of proper nutritional management. For the mother, a balanced diet supplemented with vitamin A, omega-3 fatty acids, and antioxidants can be beneficial. However, avoid excessive supplementation on your own and always follow your veterinarian’s guidance.

What should I do if my pet loses weight rapidly after giving birth?

While some weight fluctuation is normal during lactation, lethargy accompanied by tremors or seizures may indicate eclampsia (postpartum hypocalcemia). If your pet also shows a loss of appetite, vomiting, and lethargy, please consult your veterinarian immediately.

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References

[1] Serrano et al. (1964) Nutrient Requirements of Dogs and Cats. Journal of Nutrition.

[2] Applied Veterinary Clinical Nutrition, 2nd Ed. (2010). Blackwell Publishing.

[3] 100 Top Consultations in Small Animal General Practice. (2011). Blackwell Publishing.