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You can see the vet for an x-ray (not very expensive) to see how big the puppies are and to find out how many she is having. An ultrasound will do the same thing but it is much more expensive.
Your vet can also tell you a lot with just a physical exam. They will palpate the abdomen and look for lumps that feel like puppies that may even be moving if your dog is far enough along.
The best way to determine the delivery date is to take the dog's temperature. When the temp drops below 100 degrees, you can expect puppies within 24 hours.
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You MIGHT be able to tell if your dog is pregnant by feeling the abdomen yourself. You should also look at her physical appearance. Her sides might get thicker. Her breasts might drop or fill with milk.
If you suspect that she is due soon, you can take her temp. If it's below 100 degrees, you can expect puppies right away.Does this help more?
Yes. It matters. If the father is much larger than her, she might have difficulty during the delivery or need an emergency c-section.
Keep in mind, also, that you can still spay her up to 40 days gestation and this will abort the litter and prevent litters in the future. If the father is much larger than her, this might be better for her health.