A number of dogs discovered in the Russian city of Nizhniy Novgorod are blue.
Scientists would like to know exactly why the dogs are blue in color.
The dogs found near an old chemical plant, but vets say the dogs are healthy.
Blood samples came back normal for the dogs, and they have a normal appetite.
The veterinary clinic where the dogs are staying is ordering more tests.
These tests include a toxicology report on their hair, as scientists work to get to the bottom of the mystery.
