Sardinia: An Italian farmer welcomed a litter of five dogs earlier this month – and one of the pups stood out among the rest. Cristian Mallocci couldn’t believe his eyes when one of them was born with green fur.

Mallocci’s dog, Spelacchia, gave birth to four other dogs with white fur, the same color as her’s. Spelacchia is mixed-breed, but that doesn’t explain why one of her pups came out with green fur.

The strange pigmentation is believed to occur when pale puppies come in contact with biliverdin in their mother’s wound, according to Reuters. Biliverdin is also the pigment that makes bruises to sometimes appear green.

The dog, however, won’t always be green. The color will continually fade as the puppy grows and gets older, Reuters reports.

It is extremely rare for a dog to be born with green fur, but other pups like Pistachio have made headlines before. In 2017, when a green puppy was born in Massachusetts, a young boy with his own rare condition adopted him, CBS Boston reported.

Earlier this year, a green puppy was born outside of Asheville, North Carolina. The dog’s family appropriately named him The Hulk, CBS affiliate WNCN reported.

It paid off being the odd one out – the rest of Pistachio’s brothers and sisters will be given new homes, while Pisatchio will stay on the farm.

Green is a symbol of luck and hope, so it may have been meant to be that the dog could make people smile amid the COVID-19 pandemic, Mallocci said.