Signs a vet might look for:
* Mammary glands: A cat that has had kittens will typically have larger, more developed mammary glands than a cat that has never given birth. They may also have scars or changes in pigmentation around the nipples.
* Vaginal discharge: A cat can experience a post-partum discharge for a few weeks after giving birth.
* Physical examination: A vet may also notice changes in the cat's abdomen, particularly if she recently had kittens.
* Behavior: A cat that has had kittens may be more protective or maternal in her behavior.
Limitations:
* Not always obvious: Some cats may not show any obvious signs of having had kittens, especially if they were very young or if it was a long time ago.
* Individual variations: The size and development of mammary glands can vary among cats.
* Other causes: Enlarged mammary glands can be caused by other factors besides pregnancy, such as hormonal imbalances or infections.
To be absolutely sure, the vet may:
* Perform a blood test: A blood test can sometimes detect hormones related to pregnancy.
* Perform an ultrasound: An ultrasound can provide images of the uterus and confirm if there is evidence of previous pregnancies.
It's important to note that:
* A veterinarian will not be able to tell *how many* kittens a cat has had.
* If you are concerned about your cat's reproductive history, it's always best to talk to your veterinarian. They can provide the best advice based on your individual cat's situation.