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"Why would a dog slam her head off the floor? My thirteen year old lab has recently slamming her head off the floor."

This is the question I found in Yahoo Answers.

Why not use 'onto' here instead of 'off'?

As far as I know, 'off' is one of those 'source' prepositons: it shows an initial position when there is a change of location.

For example,

ex1) He jumped off the bridge.

ex2) He lifted it off the floor.

Wouldn't 'onto' make more sense than 'off' in the above sentence?
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"Off" is wrong. 'Onto' is questionable. The expected is 'on'.
Comments  
Mister Micawber, thanks for helping me out once again.Emotion: smile