Do you need to get a tetanus shot for a small glass cut on the foot?

Usually not. As long as tetanus vaccination status is current, minor injury does not require tetanus shot.
No. Some docs will be cautious and recommend it. My personal opinoin is no you don't. You are more concerned with metal, rust etc. "small glass cut" - make sure you clean it out good and apply topical antibiotic you should be fine.

Related Questions

I received a small cut on my foot from a piece of dirty glass (that was in an parking lot) do I need to get a tetanus shot? Unsure of last time I got one.

Tetanus Protocol. If you can not remember the last time you had a tetanus booster. It wouldn't be a bad idea to get one. Then you'll be good for 10 years. Better safe age than sorry. . Read more...