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D2005-26

Dear Daisy Dog

I am a twin, and I have been wondering: Do dogs and cats have twins? I am a female, and my twin is a male.

Daisy Responds

I am one of seven, if I recall correctly, so I am a septuplet. That is, I shared my mom’s uterus with six brothers and sisters.

Although you are a fraternal twin, I assume you are asking about identical twins, that is, twins formed when a single fertilized egg splits in two.

In the dog and cat world, identical twins are rare.

Almost always, puppies and kittens are fraternal twins, like you and your brother, or fraternal triplets, quadruplets or even septuplets.

This occurs when multiple eggs are fertilized and develop in the uterus at the same time.

Here’s a bit of trivia: puppies and kittens in the same litter can have different fathers.

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