Are you worried that your dog might be pregnant? Dogs can show early signs of pregnancy in small ways, but you can usually see changes in their appetite, behavior, and body shape within the first few weeks. Only a veterinarian can confirm pregnancy through tests or an ultrasound; however, spotting these signs early on helps ensure that the dog receives the right care and nutrition.
This guide will show you how to determine if your dog is pregnant by identifying the seven most common signs. It will also tell you what to do next and when to see your vet.
QUICK SUMMARY
- Watch for behavioral changes like clinginess or nesting.
- Appetite and weight gain often increase after 3–4 weeks.
- Nipples enlarge and darken due to hormone changes.
- Clear vaginal discharge may appear around week 4.
- Vet tests (ultrasound or hormone tests) confirm pregnancy.
- Keep your dog on balanced nutrition and limit stress.
- Always get professional confirmation before changing her diet or activity.
Table of Contents
1. Behavioral Changes: Your Dog May Act More Clingy or Tired
Dogs often change how they act in the first two to three weeks of pregnancy. The American Kennel Club (AKC) says that fluctuations in hormone levels might make dogs more loving, tired, or isolated.
Things You Might See
- More affection: She might follow you around more or ask for more cuddles.
- Less energy: Pregnant dogs get tired quickly and sleep longer than usual.
- Nesting behavior: Some dogs start to make beds or look for peaceful places to sleep..
- Mood swings: Your ordinarily playful dog may look angry or shy.
Advice: Make sure she is relaxed and at ease. Stress can have an effect on how a baby grows in the early stages of pregnancy.
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2. Appetite Changes: Eating More (or Sometimes Less)
It’s common for a dog’s appetite to fluctuate during the first few weeks of pregnancy. According to VCA Hospitals, dogs may temporarily lose their appetite as their hormones change, but it usually returns — often stronger than before
Look for:
- Decreased appetite in the first 1–2 weeks after mating.
- Increased hunger starting around week 3–4.
- Craving or food pickiness — she may prefer specific foods.
Expert Tip: Feed your dog high-quality food and ask your vet about switching to a “puppy formula” that is high in nutrients in the last three months.
3. Physical Changes: Enlarged Nipples and Belly Growth
By the third or fourth week of pregnancy, most dogs begin to show physical signs of change. According to PetMD, rising progesterone levels cause the nipples and mammary glands to enlarge as the body prepares for nursing.
Watch for:
- Larger, darker nipples — especially noticeable on lighter-coated dogs.
- Visible belly swelling — usually starts around week 5–6.
- Gentle firmness in the abdomen when touched (avoid pressing too hard).
Note: If your dog’s belly appears larger, it doesn’t necessarily mean she’s pregnant — it could be due to bloating or a false pregnancy. Always consult your veterinarian to confirm
💧 4. Clear Vaginal Discharge Around Week 4
A small amount of clear or slightly milky vaginal discharge can be a normal sign of pregnancy. According to the AVMA, this discharge indicates that the uterus is changing to support embryo development
However:
- But the discharge shouldn’t smell bad or be green or yellow.
- Bloody discharge may suggest infection or miscarriage, Go to the vet right away.
If unsure, call your veterinarian; early checkups can prevent complications.
5. Confirming Pregnancy: Vet Tests and Ultrasound
No matter how many signs you notice, you can’t be completely sure your dog is pregnant without a veterinary test. Most veterinarians recommend testing around 25 days after mating, when it’s possible to check hormone levels and see early embryo development
Here are some common testing options your vet may suggest:
- Ultrasound (Day 25–30): Detects heartbeat and fetal sacs.
- Blood test (Relaxin hormone): Confirms pregnancy from day 21.
- Palpation (Day 28–35): Experienced vets can gently feel developing puppies.
- X-rays (After day 50): Estimate litter size once bones form.
To keep both the mother and the puppies healthy, schedule an exam early.
READ MORE: Can a Dog Be Spayed While in Heat? What Every Dog Owner Needs to Know
6. Reduced Activity and Mild Morning Sickness
Some dogs experience mild morning sickness as their hormones fluctuate, similar to humans. According to the AKC, light nausea or occasional vomiting may occur around the third week of pregnancy.
Things to Look Out For:
- Occasional vomiting or gagging
- Tiredness or lethargy
- Less interest in playtime
However, persistent vomiting or diarrhea is not normal. Contact your vet if symptoms continue for more than 24 hours.
7. Nesting and Motherly Behavior Before Labor
The last two weeks of pregnancy are when dogs start to nest. This suggests they are setting up a safe home for their puppies to live. PetMD explains that this behavior normally starts around a week before the kid is born.
Common Nesting Behaviors:
- Shredding blankets or towels
- Scratching the floor or bedding
- Seeking warm, quiet corners
- Increased protectiveness
Tip: Make sure your dog gives birth in a clean, quiet area of your home that’s free from heavy foot traffic and noise.
What to Do If You Think Your Dog Is Pregnant
Proper early care helps ensure both a healthy pregnancy and a smooth delivery.
If you think your dog might be pregnant, here are a few simple steps to take:
- Schedule a vet visit for confirmation and nutritional advice.
- Don’t work out too hard, but keep walking slowly.
- If verified, switch to a high-calorie puppy diet after week 5.
- Prepare a whelping box 1–2 weeks before her due date.
- Track symptoms and call your vet if anything seems unusual.
FAQs
1. How soon can you tell if your dog is pregnant after mating?
Usually within 3–4 weeks. A vet ultrasound or relaxin test can confirm it around day 25 after mating.
2. Can dogs have false pregnancies?
Yes. Hormonal changes after heat can mimic pregnancy symptoms — including enlarged nipples and nesting — even without puppies.
3. What are the early signs of a dog pregnancy?
Mild behavior changes, nipple swelling, tiredness, and appetite loss during the first 2–3 weeks are early indicators.
4. Can my dog still go into heat if she’s pregnant?
No. Once pregnant, she will not go into heat again until after giving birth and recovery.
5. Should I spay my dog to prevent pregnancy?
Yes, spaying prevents accidental litters and reduces the risks of infections or cancers. Talk to your vet about the best timing.
Karim Kaifi is an experienced pet owner and writer. He shares practical, research-backed advice based on over 10 years of caring for cats and dogs.
