Dog Pregnancy Calculator
Enter the mating date to find your dog's estimated due date, days remaining and current pregnancy stage.
Average dog gestation is 63 days (range 58–68 days). May vary by breed.
Mating date
This calculator produces estimates based on the mating date. Actual birth may occur a few days earlier or later. Consult a veterinarian for health concerns or signs of complications. This tool does not replace veterinary advice.
How Long Is Dog Pregnancy and How Is It Calculated?
Dog pregnancy averages 63 days, but it can range from 58 to 68 days depending on breed and the individual dog. The estimated due date is the mating date plus 63 days. The tool also shows the dates for day 58 and day 68, so you can see the early-to-late range.
Dog Pregnancy Stages
| Stage | Days | Development | Key Signs |
|---|---|---|---|
| 1st Trimester | 1–21 | Embryo formation, implantation | Few signs, decreased energy, mild nausea |
| 2nd Trimester | 22–42 | Organ development, skeleton | Belly growth, ultrasound visible |
| 3rd Trimester | 43–63 | Rapid growth, birth prep | Swollen teats, nesting behavior |
How the Due Date Calculation Works
The tool adds three different day counts to the mating date to create a birth window:
+58 days
Early Birth
Lower bound
+63 days
Average (Expected)
Most likely date
+68 days
Late Birth
Upper bound
What Are the Signs of Dog Pregnancy?
Signs may be very subtle in the first weeks of pregnancy. Both physical and behavioral changes become more pronounced over time. The lists below summarize what to expect week by week.
Physical Changes (Nipples, Belly Swelling and Appetite)
🐕
Weeks 1–3
No visible signs. Mild nausea and lower energy are possible.
🔍
Week 4
Nipples enlarge and darken. Belly begins to swell slightly.
📈
Weeks 5–6
Belly clearly enlarges. Appetite increases; smaller, more frequent meals may be needed.
🍼
Weeks 7–9
Belly is very large; puppies can be felt. Appetite may decrease near birth.
Behavioral Changes (Lethargy and Nesting Instinct)
😴
Early Weeks
Sleeps more than usual. Reduced interest in play.
🤝
Mid-Pregnancy
Stays closer to the owner and looks for attention and reassurance.
🏠
Late Pregnancy
Gathers blankets or towels and retreats to corners. This is the nesting instinct.
⚠️
Pre-Labor
Restlessness, shivering, loss of appetite. Temperature drops; contractions begin.