Why does my cat like our vibrating bed. She's purring and happy : r cats Scientists have found that a cat's purr may actually support healing. A cat's purr vibrates between 25 and 150 hertz, the same frequency range used in medical vibration therapy to strengthen bones Pet Dog Cat Massaging Vibrating Mitt pet supplies Amazon.com: PAW WAVE Buzz Therapeutic Brush Vibration Pet Massager for Dogs and Cats Designed to Help Soothe Tension, Increase Circulation and Relieve Tight Muscles A small sound with big power. A cat's purr isn't just cozy background noise. It sits mostly between 25 and 150 Hz the same range used in some medical vibration therapies.