Post-Whelping Complications — Mastitis, Eclampsia & What to Watch For

The delivery is over, the puppies are nursing, and the hardest part seems behind you. But the first 2-4 weeks after whelping are actually one of the highest-risk periods for the dam. Complications can develop quickly, and some — like eclampsia — can become life-threatening within hours.

Knowing what to watch for, when each complication typically appears, and which ones require emergency veterinary care versus careful monitoring at home is essential knowledge for every breeder.

When complications typically appear

Different complications have different timelines. Understanding when each one typically occurs helps you know what to watch for and when.

Eclampsia (milk fever)

Eclampsia is the most dangerous post-whelping complication. It occurs when the dam's blood calcium drops to critically low levels, usually because milk production is depleting calcium faster than the body can replace it.

Who's at risk?

• Small breeds — Chihuahuas, Yorkies, Pomeranians, Toy Poodles are most commonly affected
• Large litters — More puppies means more milk production and faster calcium depletion
• First-time dams — Less metabolic adaptation to the demands of lactation
• Poor nutrition during pregnancy — Dams that weren't on an appropriate diet are more vulnerable

Symptoms — in order of progression

1. Early: Restlessness, panting, pacing, whining — easy to mistake for normal post-whelping behavior
2. Progressing: Stiff, stilted gait, muscle tremors, hypersensitivity to touch and sound
3. Severe: Inability to stand, full-body trembling, drooling, glazed expression
4. Critical: Seizures, extremely high body temperature, loss of consciousness

The progression from early signs to seizures can happen within 1-2 hours. Don't wait to see if it gets better.

Prevention

• Feed a high-quality puppy food or lactation diet during nursing — these are calcium-rich. See our guide on feeding the nursing dam for detailed nutrition recommendations
• Do NOT supplement calcium during pregnancy — paradoxically, this can suppress the body's calcium-regulating hormones and make eclampsia more likely postpartum
• Consider supplementing calcium during nursing (after whelping), with vet guidance
• For at-risk breeds with large litters, discuss a preventive calcium supplementation plan with your vet

Mastitis

Mastitis is an infection of one or more mammary glands. It can range from mild inflammation that resolves with continued nursing to severe abscess formation requiring surgical drainage.

Symptoms

• One or more glands that are hot, hard, swollen, and painful to the touch
• The dam may flinch or cry out when puppies nurse on the affected side
• Fever — temperature above 103°F (39.4°C)
• Discolored milk — yellow, green, blood-tinged, or thickened from the affected gland
• Reduced appetite and lethargy
• In severe cases, the gland may develop a purple discoloration indicating tissue damage

What to do

• Mild cases: Apply warm compresses to the affected gland 3-4 times daily. Encourage puppies to nurse on that side — continued milk flow helps clear the infection. Monitor closely
• If the dam has a fever or the gland is severely swollen: Veterinary treatment is needed. Antibiotics are the standard treatment, and your vet will choose ones safe for nursing puppies
• Severe/abscessed: May require surgical drainage. The puppies may need to be prevented from nursing on that gland

Retained placenta

Each puppy has its own placenta, which should be delivered within 15 minutes of that puppy's birth. A retained placenta — one that stays in the uterus — creates a site for bacterial infection.

How to know

• Count placentas during whelping — There should be one per puppy. If you're missing one or more, a placenta may be retained. (Some placentas are delivered together, making counting difficult — your vet can confirm with ultrasound)
• Foul-smelling, dark discharge 24-48 hours after whelping
• Fever and lethargy developing within the first 2-3 days

A retained placenta always warrants a vet call. In many cases, the vet will administer oxytocin to help the uterus contract and expel the placenta. If infection has developed, antibiotics will be needed.

Metritis

Metritis is a bacterial infection of the uterus. It can develop from a retained placenta, from trauma during a difficult delivery, or after a C-section. It's more severe than a retained placenta alone and can become life-threatening if untreated.

Symptoms

• High fever — often 104°F+ (40°C+)
• Foul-smelling, purulent vaginal discharge — thick, discolored, with a distinctly bad odor
• Severe lethargy — the dam is listless and unresponsive to puppies
• Refusing to eat or drink
• Dehydration — dry gums, loss of skin elasticity
• Reduced or absent milk production — the body is redirecting resources to fight infection

Agalactia

Agalactia is the failure to produce milk, or producing milk in insufficient quantities. If the dam can't feed the litter, you need a plan immediately — newborn puppies can't survive more than a few hours without nutrition.

Possible causes

• Premature delivery — Mammary glands may not have fully developed
• Stress or pain — Especially after a difficult labor or C-section
• Hormonal issues — Insufficient prolactin or oxytocin release
• Infection — Mastitis can reduce production in affected glands
• Medication side effects — Some drugs can suppress lactation

What to do

1. Immediately: Begin supplemental feeding with puppy milk replacer. If puppies can't bottle feed, tube feeding may be necessary
2. Contact your vet: They may prescribe medications to stimulate milk production (metoclopramide or domperidone)
3. Keep puppies nursing: Puppy suckling stimulates milk production. Even if milk isn't flowing yet, the stimulation helps
4. Ensure the dam is hydrated and well-fed: Dehydration and poor nutrition suppress milk production

Subinvolution of placental sites

After whelping, the sites where the placentas were attached to the uterine wall gradually heal and contract. This process (involution) normally completes within 12-15 weeks, with visible bloody discharge tapering off by week 2-3.

Subinvolution occurs when these sites fail to heal normally, resulting in prolonged bloody vaginal discharge beyond the expected 2-3 weeks. It's most common in young dams (first or second litter).

When to be concerned

• Bloody discharge continuing beyond 3 weeks postpartum
• Fresh, bright red bleeding (as opposed to the normal brownish discharge that should be fading)
• Discharge that had stopped and then restarted

Subinvolution is usually not immediately dangerous, but it requires veterinary evaluation to rule out more serious causes of bleeding. Treatment may include oxytocin injections or, in persistent cases, further investigation.

Daily monitoring checklist

For the first 2 weeks postpartum, build these checks into your daily routine:

• Take the dam's temperature — twice daily. Normal is 100-102.5°F (37.8-39.2°C). Anything above 103°F (39.4°C) warrants a vet call
• Check all mammary glands — Feel for heat, hardness, or swelling. Compare sides
• Observe vaginal discharge — Note color, amount, and smell. Keep a log
• Monitor appetite and water intake — Nursing dams should be eating significantly more than normal
• Watch for behavioral changes — Panting, restlessness, trembling, or reluctance to nurse
• Weigh all puppies daily — A sudden drop in weight gain across the litter may indicate the dam has a problem, not the puppies. Use the Weight Tracker to spot trends

Post-whelping complications FAQs