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The phenomenon is believed to occur when pale-colored puppies make contact with a green pigment called biliverdin while in the womb, according to the news organization.

It is believed to be a result of the puppy making contact with a green pigment called biliverdin while in the womb.

It is thought that it happens when pale coloured puppies have contact in their mother’s womb with a green pigment called biliverdin.

Scientists came across the complex while trying to understand how hundreds of tree frog species can accumulate large amounts of a toxic green pigment known as biliverdin.

In most animals, biliverdin is so dangerous that it is immediately broken down or excreted.