Dog Shaking With His Head

To put the G force effect into perspective, on the fastest roller-coasters you may experience a maximum of up to 4G. And if you were to be in a jet and you are not a pilot (or wearing a G-force suit), most people usually black out between 4 and 6 G’s.
At the opposite end of the scale, the largest dogs and large mammals such as bears shake as slow as 4 hertz or four complete shakes per second.