Volunteers who encountered dogs with blue fur in Chernobyl believe that the coloration of these stray animals changed not because of some bizarre mutation from decades of radiation exposure, but for a much more mundane reason.
The Chernobyl Exclusion Zone is a restricted area that suffered heavy radioactive contamination after the disaster at the Chernobyl Nuclear Power Plant. This zone, covering 2,576.9 square kilometers, was established in 1986 after authorities evacuated 120,000 residents from the 30-kilometer radius around the plant.
What Could Have Caused the Dogs’ Blue Fur?
In an interview with IFLScience, volunteer researchers from the “Dogs of Chernobyl” project confirmed the photographs are authentic and said the team has documented at least three blue dogs.
After several attempts, the volunteers were unable to capture the animals. “They probably rolled in some blue liquid that stained their fur. We suspect this substance leaked from an old portable toilet; however, we have not yet been able to confirm these suspicions,” said Jennifer Betz, a veterinarian and the project leader for “Dogs of Chernobyl.” Dr. Betz added that her team does not believe the dogs’ coloration is related to radiation in Chernobyl.
Thus, the leading theory is that the dogs rolled in a bright blue chemical liquid. Researchers hope the substance will not harm the dogs. “The animals appear healthy, just like all the dogs we encountered during our time in Chernobyl,” Dr. Betz noted.
After the Chernobyl disaster, local residents had to leave behind their beloved pets, which have managed to survive and even thrive in the abandoned lands surrounding the power plant.
The “Dogs of Chernobyl” project is an initiative of the international charity Clean Futures Fund, which focuses on monitoring and sterilizing abandoned, semi-wild animals. Since 2017, the organization’s volunteers have sterilized over 1,000 cats and dogs.
Typically, these animals are marked with a temporary color-coded marker—green, red, blue, or purple—on their heads to indicate which ones have already undergone surgery. This mark washes off in two to three days, unlike the persistent blue dye covering the recently discovered dogs from head to toe, explained Dr. Betz.
Previous studies have shown that wild boars, foxes, songbirds, and raccoon dogs inhabit the Chernobyl Exclusion Zone. Scientists say local wolves have developed protective mutations that increase their chances of surviving radiation exposure.
Photo: Clean Futures Fund
