Cavalier King Charles Spaniel pregnancy
Cavalier King Charles Spaniel pregnancy: gestation, litter size and C-section risk
Updated October 2026 · Information only, not veterinary advice
Step 1
What do you know?
Puppies are due
- Earliest, day 56
- Nov 24, 2026
- Latest, day 70
- Dec 8, 2026
A 14-day window, based on the mating date. Sperm can survive 5–7 days, so conception may be later than the tie.
Day 14 of 63 · week 2
22%Breed profile
Cavalier King Charles Spaniel
small breed
- Average litter
- 5 puppies (2–7)
- C-section risk
- medium
Worth knowing
- Ensure comfortable, stress-free whelping environment
Temperature watch: take her temperature twice a day from day 56. A drop below 99.0°F (37.2°C) means labor within 12–24 hours.
Source: Borge et al., Theriogenology 2011 — 10,810 litters, 224 breeds.
Your calendar
Sixteen dates to put in the diary
Cavalier King Charles Spaniel pregnancy at a glance
| Cavalier King Charles Spaniel | |
|---|---|
| Gestation from ovulation | 62 to 63 days (63 days average) |
| Gestation from mating | 56 to 70 days |
| Typical litter | 5 puppies (range 2 to 7) |
| Size group | small breed |
| C-section risk | Moderate risk |
Gentle nature; ensure cardiac check prior to breeding and monitor during labor.
Heart health comes first
The breed is prone to a heart valve condition, and a cardiac check is recommended before breeding. If she has a heart murmur, tell your vet so they can plan monitoring and delivery.
Moderate delivery risk
Some Cavaliers need help or a C-section. An X-ray around day 50 shows puppy numbers and head size.
A calm whelping area
Set up the whelping box in a quiet, warm room and keep other pets and noise away.
What to watch for in Cavalier King Charles Spaniels
- Ensure comfortable, stress-free whelping environment
Dates to put in the diary
| When | What |
|---|---|
| Day 25 to 30 | Ultrasound to confirm pregnancy |
| Day 50 to 55 | X-ray to count puppies and check head size |
| From day 56 | Take her temperature twice a day |
| Day 63 | Expected due date from ovulation |
Add all of these to your phone with the whelping calendar, and track her temperature with the temperature log.
Call your vet now if…
- Green or black discharge before the first puppy is born.
- Strong straining for 30 to 60 minutes with no puppy.
- More than two to four hours between puppies when you know more are still inside.
- Tremors, stiffness, collapse or seizures at any point (possible low blood calcium).
Questions
Frequently asked questions
How long is a Cavalier King Charles Spaniel (Cavalier) pregnant?
Cavalier King Charles Spaniels are pregnant for about 63 days from ovulation, and most whelp in 62 to 63 days. Counted from a mating date, the normal range is 56 to 70 days, because conception can happen days after mating. Use the calculator on this page to get a date range.
How many puppies can a Cavalier King Charles Spaniel (Cavalier) have?
A typical Cavalier King Charles Spaniel litter is about 5 puppies, with a range of 2 to 7. First litters and litters from older dogs are often smaller. An abdominal X-ray after day 50 gives the actual count.
Does a Cavalier King Charles Spaniel need a C-section?
The risk of a C-section is moderate for Cavalier King Charles Spaniels. An X-ray around day 50 helps your vet decide between natural whelping and planned surgery.
What are the signs a Cavalier King Charles Spaniel is pregnant?
Around three to four weeks you may notice a smaller appetite, pinker and larger nipples and a clear mucus discharge. Her belly grows from about week six. Confirm with an ultrasound at about day 25 to 30.
When should a pregnant Cavalier King Charles Spaniel have an X-ray?
Between about day 50 and day 55. By then the puppies’ skeletons show, so your vet can count them and compare head size with her pelvis.
Keep reading
Related tools and guides
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Narrow the window to about two days with progesterone or LH dating.
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