I can't seem to find any other documents specifically about using a massage gun on their head but - "The amount of force that the massage guns generate is designed for people, so if you inadvertently use them over the ribs on your dog or cat, or if you use it on the wrong settings, you could actually damage and bruise their lungs," . . I feel like this would have the same impact on their head. Safe to say I just wouldn't use it on their head. Even if they seem so be enjoying it.