G forces understanding
If the moving object or animal were on a frictionless plane and no other opposing forces - it will continue to move at a constant speed infinately, reguardless of g.
G only pulls down and continues to pull the animal toward the ground, while the animal must oppose this force, as soon as it stops opposing this force, it will be pull to the ground and its foward momentum will be stopped by friction.
Is this what you are asking??? Or are you wanting the actual mechanics of the animals body???