Scientists say a cat's purr may do more than just sound comforting Studies suggest the vibrations fall between 25 and 150 Hz, a range linked to relaxation and stress reduction. Some researchers HEJULIK Electric Cat Massager, Handheld Pet Massager for Indoor Cats and Dogs, Cat Head and Back Massager Tool for Relieve Anxiety Stress, Tight Muscles and Stiffness Walmart.com Cat purrs are more than just comforting sounds. Research shows they may actually help heal the body. Scientists have found that when cats purr, the vibration of their sound falls between 25 My Cat's Secret Obsession! Why Felines Adore Massagers & Vibrators