This article was based on material provided by the CEN news agency. We have been unable to verify its accuracy independently, for reasons explained here.
Dog breeder Aida Vallelado Molina got a shock recently when her dog gave birth to two green puppies.
Molina, who breeds hunting dogs with her father Manuel Vallelado, said: "I thought the puppies were maybe dirty somehow and I tried to clean them, but the colour wouldn't come off and then I realised it was the colour of their fur."
The green puppies were born smaller and weaker than the other puppies in the litter. One of them, a female, sadly died shortly after birth.
But the male puppy is still alive although weak. He is also gradually beginning to lose his colouring.
The cause for the colouring has been given as exposure to a substance called biliverdin, which can be found in the placenta.