A couple were stunned when one of their pet dog’s puppies was born green.

Two-year-old golden labrador Buttons was in labour for 28 hours at the home of Clayton-le-Moors couple Naomi Grimes and Kyle Murray. The pair were stunned when the second puppy in a litter of eight appeared to have an unusual green glow.

Alarmed, they did a quick internet search and discovered that the pup, now named ‘Hulk’, had an unusual but temporary condition.

Naomi’s mother Sandra Grimes who was visiting the Pickup Street home at the time said they were stunned by the pup’s appearance.

She said: “At first we thought it must be just because of the birth and it would wash off. When that didn’t work we got a bit alarmed and starting searching the internet.”

They discovered that vary rarely when a puppy is born, the amniotic fluid mixes with the placenta and dyes the coat of the puppy, and it almost always happens to very light coloured puppies.

The condition fades in a few weeks.

Sandra said: “Hulk is adorable and when his brothers and sisters huddle together he has to be on top and in the middle so he can get as warm as possible.”

Naomi added: “We’ve tried not to name the puppies because they are for sale and we don’t want to get attached, but Hulk is really cute. It wasn’t totally obvious at first, but when we put him down next to the others you could really see it. Hulk is definitely one of a kind.”