As a dog approaches the end of pregnancy, breeders naturally become more attentive — watching for signs that labor is near.
Knowing what to look for, and what those signs actually mean, helps breeders stay calm and prepared rather than reactive and uncertain.
Labor in dogs does not happen all at once. It unfolds in stages, each with its own signals. Understanding those stages makes the whole process easier to navigate.
This article covers the key signs of approaching and active labor — from early behavioral shifts days before delivery to the physical indicators that whelping is imminent.
The three stages of labor in dogs
Canine labor is typically described in three stages, and the signs breeders observe depend on which stage is unfolding.
Stage one is the preparation phase. The cervix dilates and the uterus begins contracting, but no puppies are delivered yet. This stage can last anywhere from six to twenty-four hours and is often the most confusing to observe because the outward signs are behavioral rather than physical.
Stage two is active delivery. Visible contractions occur, and puppies are born. Each puppy is typically delivered within thirty to sixty minutes of visible straining, though gaps between puppies can vary.
Stage three involves the passage of placentas. A placenta is usually delivered after each puppy, though not always immediately. Most breeders keep count to confirm all placentas are passed.
The signs most breeders search for — and the ones covered here — are primarily the signals that stage one is beginning and that active delivery is approaching.
At a glance
Three Stages of Canine Labor
6–24 hours
Cervix dilates, nesting behavior, panting and restlessness. No puppies delivered yet.
15–60 min per pup
Visible contractions, puppies born. Normal breaks between puppies vary widely.
After each puppy
One placenta per puppy. Count them — a retained placenta needs veterinary attention.
| Labor Stage | Duration | What You'll See | When to Call Vet |
|---|---|---|---|
| Stage 1 — Cervical dilation | 6–24 hours | Restlessness, panting, nesting, loss of appetite, temp drop below 99°F | No progression to stage 2 within 24 hours of temp drop |
| Stage 2 — Active delivery | 1–24 hours (total) | Visible contractions, puppies delivered every 30–60 min, dam breaks sacs and severs cords | Straining >30 min with no puppy; >4 hours between puppies |
| Stage 3 — Placenta passage | Minutes after each pup | One placenta per puppy, dam may eat placentas (normal) | Placenta count doesn't match puppy count after whelping |
Durations are typical ranges — individual variation is normal. First-time mothers may take longer.
The temperature drop: the most reliable early indicator
Among all the signs that labor is approaching, a drop in rectal temperature is the most consistent and measurable indicator available to breeders.
A dog's normal resting temperature typically falls between 101°F and 102.5°F. In the period leading up to labor — usually within twelve to twenty-four hours — temperature drops noticeably, often falling below 99°F and sometimes below 98°F.
This drop is caused by a shift in progesterone levels that triggers the onset of labor. It is temporary, and temperature returns to normal as active labor begins.
To use this sign effectively, breeders take rectal temperature readings twice daily in the days approaching the expected whelping window. A single low reading is more meaningful when compared against a baseline of normal readings taken over several days.
Without a baseline, a low temperature reading is harder to interpret. Consistent monitoring turns the temperature drop from a vague signal into a reliable one.
Temperature Threshold
Below this typically means labor within 12–24 hours
Behavioral changes in early labor
Alongside — and sometimes before — the temperature drop, behavioral changes are often the first thing breeders notice.
These changes reflect the discomfort and hormonal shifts of early labor, and they can vary significantly between individuals. Some dogs become visibly anxious and unsettled. Others become unusually quiet and withdrawn. Either can be normal.
Common behavioral signs in the hours before active labor include restlessness and an inability to settle, repeated repositioning or circling, panting that is not explained by heat or exertion, and a reluctance to eat or a complete loss of appetite. Some dogs vomit or appear mildly nauseous in early labor.
Nesting behavior is also common — a dog may scratch at bedding, rearrange her whelping area, or seek out a quiet, enclosed space. This instinct to prepare a safe environment is a natural part of pre-labor and is one of the more recognizable early signs.
Behavioral changes alone do not confirm that labor is imminent — they can occur for other reasons, and some dogs show very few behavioral changes before delivering. Paired with a temperature drop and the timing of the pregnancy, however, they build a more complete picture.
Physical signs that labor is near
As labor approaches and progresses into stage one, physical changes become more apparent.
The vulva typically softens and swells in the days before delivery. Some dogs have a clear or slightly colored vaginal discharge in the hours before labor — this is normal and indicates that the cervix is beginning to dilate.
The abdomen may shift or drop slightly in position as puppies move into the birth canal. This is more noticeable in some dogs than others depending on body type and litter size.
Mammary glands are usually full and firm by the time labor is near, and some dogs begin producing milk in the days before delivery. The presence of milk does not by itself confirm that labor is imminent, but it is a useful part of the overall picture.
As stage one transitions into stage two, visible abdominal contractions begin. These are the clear signal that active delivery is underway. The first puppy is typically delivered within thirty to sixty minutes of strong, visible straining.
What normal labor looks like
Understanding the range of what is normal during labor helps breeders avoid unnecessary alarm while also knowing what to watch for.
Puppies are typically delivered every thirty to sixty minutes, though this varies. A resting interval between puppies — where the mother settles, nurses the previous puppy, and shows no sign of distress — can be normal, particularly in longer labors.
Each puppy is born in a fluid-filled sac. The mother usually removes this sac and stimulates the puppy by licking. If she does not do this promptly, the breeder can step in — clearing the airway and stimulating breathing is a practical skill worth knowing before whelping begins.
Placentas follow each puppy, often within a few minutes. Keeping a count of placentas passed helps confirm that none are retained, which can cause complications if left unaddressed.
Labor can be physically demanding and tiring. Some mothers rest between puppies, nurse briefly, or reposition frequently. This is normal, provided they are not showing signs of distress and labor is progressing.
Signs that may need closer attention
Most labors proceed without complication. But certain patterns are worth knowing in advance so that breeders can act promptly when needed.
Contact a veterinarian if active straining continues for more than thirty to sixty minutes without a puppy being delivered, if more than two to four hours pass between puppies with no sign of progress, if the mother shows signs of exhaustion or extreme distress, if a green or black discharge is present before the first puppy is delivered, or if a puppy appears stuck in the birth canal.
It is also worth noting that some dogs — particularly certain brachycephalic breeds — have anatomical characteristics that make natural delivery more difficult. Breeders working with these breeds often coordinate with a veterinarian before the whelping window to discuss timing and contingency planning. Read more about C-sections in dogs if your breed has a high surgical delivery rate.
These situations are not listed to create alarm. Most labors resolve without intervention. They are listed because recognizing them early gives better options than waiting until a situation has progressed further.
Preparing before labor begins
The time to prepare for labor is before the signs appear, not during them.
Having the whelping area set up, supplies on hand (use the Whelping Supplies Checklist to stay organized), and a thermometer ready for daily readings in the final week makes the actual labor experience calmer and more manageable.
Knowing your veterinarian's after-hours contact, having a plan for emergency situations, and being familiar with the basic steps of assisting a delivery all contribute to a more confident response when the time comes.
Breeders who have tracked pregnancy progress consistently — noting weights, behavioral patterns, and baseline temperatures — are better positioned to recognize meaningful changes when they occur. This is one reason keeping accurate breeding records from day one pays off. Records created during pregnancy become directly useful during delivery.
After the last puppy is delivered
Once the final puppy is delivered and all placentas have passed, the immediate post-whelping period begins.
The mother will typically focus on cleaning and nursing her puppies. Ensuring that all puppies nurse in the first few hours — particularly to receive colostrum — is one of the most important tasks immediately after whelping.
Monitoring the mother for signs of retained placenta, fever, or unusual discharge in the days following delivery is standard practice. Most post-whelping complications that do occur are more manageable when recognized early.
The transition from labor to the neonatal period happens quickly. Having a plan for both makes the entire experience more organized and less stressful for breeder, mother, and litter alike.
Labor and whelping FAQs
1How do I know when my dog is going into labor?
The most reliable early sign is a rectal temperature drop below 99°F, which typically occurs 12 to 24 hours before active labor begins. Behavioral changes — restlessness, nesting, panting, and loss of appetite — often accompany or follow the temperature drop. No single sign is definitive, so read them together alongside where she is in her roughly 63-day gestation.
2What temperature drop signals labor, and how do I track it?
A drop below 99°F — and often below 98°F — usually means labor will start within 12 to 24 hours. Because a dog's normal resting temperature is about 101–102.5°F, the drop only stands out if you have a baseline. Take rectal temperatures twice a day through the final week so a single low reading is meaningful rather than ambiguous.
3How long does labor last, and how far apart should puppies come?
Stage one (cervical dilation) lasts roughly 6 to 24 hours with mostly behavioral signs. Stage two (active delivery) can run from a few hours to over twelve depending on litter size, with puppies usually arriving every 30 to 60 minutes. A resting pause of up to about two hours can be normal if the dam is calm, not straining, and clearly between puppies.
4How long between puppies is too long?
Call your vet if the dam strains hard for more than 30 minutes without producing a puppy, or if more than two hours pass with active contractions and no delivery. A longer, calm pause with no straining can be normal, but visible effort that isn't producing a puppy is not — that pattern is the most common early sign of a stalled labor.
5What are the warning signs of a whelping emergency (dystocia)?
Treat any of these as an emergency and call your vet immediately: strong straining for 30+ minutes with no puppy; more than two to four hours between puppies; green or black discharge before the first puppy is born; a puppy visibly stuck in the birth canal; no labor within 24 hours of the temperature drop; foul-smelling discharge; a fever above 103°F; or a dam who is weak, collapsing, or in obvious distress. Dystocia is always time-sensitive.
6Is green or dark discharge normal during labor?
Dark green discharge after the first puppy has been born is normal — it comes from the pigment released as a placenta separates. The same discharge before any puppy has been delivered is a warning sign that a placenta has detached and a puppy may be in distress, which is an emergency. Timing relative to the first delivery is what tells you which situation you are in.
7My dog is past her due date — when should I worry?
Gestation is about 63 days from ovulation, but counting from the breeding date can be off by several days because mating and ovulation don't always line up. The temperature drop is a more reliable trigger than the calendar. If she is clearly overdue, or if her temperature has dropped and 24 hours pass with no labor, have her checked by a vet.
8Should I stay with my dog, and when do I step in?
Stay nearby and observe quietly without interfering with a labor that is progressing normally. Step in only when needed — if the dam does not open the sac or stimulate a newborn within a minute or so, clear the puppy's airway and rub it briskly to start it breathing. Knowing these basic assists before whelping begins lets you act calmly rather than scrambling.
9Do I need to cut umbilical cords or count placentas?
The dam usually severs the cords herself. If she does not, tie the cord with clean thread about an inch from the belly and cut on the far side. Count one placenta per puppy and note any mismatch — a retained placenta can cause infection and warrants a vet call. Most dams eat the placentas, which is normal, though a very large number can cause loose stools.
Related Tools
Sources: Merck Veterinary Manual (Canine Parturition and Dystocia chapters); Concannon PW. Reproductive cycles of the domestic bitch. Animal Reproduction Science (2011) 124:200–210; BSAVA Manual of Canine and Feline Reproduction and Neonatology (England GCW, von Heimendahl A eds.); Johnston SD, Root Kustritz MV, Olson PNS. Canine and Feline Theriogenology. Saunders; AKC Canine Health Foundation. This article is for educational purposes and does not replace professional veterinary care. If labor stalls or you observe signs of dystocia, contact your veterinarian immediately.