Which is grammatically correct foxes tail or tail?

Both "foxes tail" and "tail" can be grammatically correct, but it depends on the context:

* "Foxes tail" is correct if you are referring to the tail of multiple foxes (plural). For example, "The foxes' tails were wagging excitedly."

* "Tail" is correct if you are referring to the tail of one fox (singular). For example, "The fox's tail was bushy and red."

To clarify which is correct, you need to know whether you are talking about one fox or more than one fox.