Miscarriage in Dogs​

Miscarriage in Dogs

What Is Miscarriage in Dogs?

A miscarriage, also known as spontaneous abortion, occurs when a pregnant dog loses one or more puppies during gestation. It can happen early (before signs of pregnancy are obvious) or later in the term, sometimes with visible symptoms, and other times without warning.

Some miscarriages result in full pregnancy loss. Others may affect just one or two embryos, with the rest of the litter carried to term.

Whether you’re an experienced breeder or preparing for your first litter, understanding the causes and warning signs of miscarriage in dogs helps protect the health of your dam and future pups.

Causes of Miscarriage in Dogs

There is no single cause for miscarriage in dogs. The risk increases when multiple factors are at play.

Common causes include:

  • Hormonal imbalances – such as low progesterone
  • Infections – including canine herpesvirus, E. coli, or brucellosis
  • Poor uterine health – from scarring, cysts, or pyometra
  • Genetic abnormalities – in embryos or due to inbreeding
  • Trauma or stress – especially in early pregnancy
  • Nutritional deficiencies – particularly in calcium or folic acid
  • Medications or toxins – exposure during pregnancy
  • Age or fertility issues – in older dams or those with irregular heat cycles

Signs of Miscarriage in Dogs

Some miscarriages occur without any visible signs, particularly in early pregnancy. Others present clear symptoms that breeders should treat as emergencies.

Possible signs include:

  • Vaginal bleeding or unusual discharge
  • Sudden drop in appetite or energy
  • Visible expulsion of foetal tissue
  • Signs of abdominal pain or cramping
  • Fever or signs of infection
  • Cessation of mammary gland development
  • Reabsorption of pregnancy confirmed by ultrasound

Always contact your vet immediately if you notice any abnormal signs in a pregnant dog.

How to Diagnose Miscarriage

Veterinary diagnosis may involve:

  • Ultrasound scans – to confirm the presence or loss of foetuses
  • Progesterone testing – to assess hormonal levels
  • Blood work and cultures – to detect infections
  • Vaginal cytology or swabs – for bacterial or viral causes

Early detection can make a difference in preventing further loss or protecting future fertility.

Diagnosis and Treatment of Pyometra in Dogs

Vets typically diagnose pyometra through a combination of:

  • Physical examination
  • Bloodwork to check for elevated white cell counts
  • Ultrasound or X-rays to confirm an enlarged, pus-filled uterus

Treatment options:

  • Emergency surgery (ovariohysterectomy): Most common and often life-saving
  • Medical management: Only used in select cases for breeding dogs with open pyometra and no complications

Even with successful treatment, future fertility is not guaranteed. Most vets recommend retiring a dog from breeding after pyometra.

Managing Miscarriage in Dogs

If miscarriage occurs, treatment depends on the cause and stage of pregnancy. Options may include:

  • Antibiotics for infections
  • Progesterone support
  • Uterine cleaning or medication to prevent retained tissue
  • Surgery in severe or life-threatening cases
  • Rest, hydration, and nutritional support during recovery

Vets may also recommend delaying future breeding until the dog’s reproductive health has fully stabilised.

Preventing Miscarriage in Dogs

Responsible breeders take proactive steps to minimise risk and support healthy pregnancies.

Prevention strategies include:

  • Genetic screening of breeding pairs
  • Regular vet checks before and during pregnancy
  • Ensuring up-to-date vaccinations and parasite control
  • Avoiding stressful environments during gestation
  • Using hormone monitoring (e.g., progesterone testing)
  • Supplementing with vet-approved prenatal nutrients
  • Avoiding excessive handling or activity in late pregnancy

RPBA members receive access to breeding checklists and litter tracking templates to help monitor each stage from mating to whelping.

Join RPBA and Breed with Confidence

Miscarriage in dogs is heartbreaking, but with the right knowledge and support, many cases can be prevented or better managed. RPBA is here to help you every step of the way. We believe supporting breeders leads to better outcomes for dogs, litters, and owners alike. Not a member yet? Join RPBA today and gain access to trusted breeding tools and expert guidance.

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Calcium for Pregnant Dog

Dog Artificial Insemination Kit

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