Dogs chasing their tails could help scientists treat OCD in humans.

New research has shown genetic variations in people lead to obsessive-compulsive disorder, and there are similar variations in dogs who suffer from OCD.

Just as there are dogs who chase their tails to the point of exhaustion -- there are people who wash their hands until they bleed.

Certain breeds of dogs, like German shepherds, Doberman pinschers, bull terriers and Shetland sheepdogs, have high rates of OCD.

Researchers found four genetic markers in these breeds, and while OCD in humans is much more complex, they hope study will lead to breakthroughs to develop medications to treat or minimize the disease.