The original sentence is: A mother dingo doesn’t hunt small prey near her den, leaving it to her pups.
This sentence is almost correct but is a little unclear. The phrase "leaving it to her pups" could be confusing because "it" does not clearly refer to "small prey." To make the sentence clearer and grammatically correct, you can say:
A mother dingo doesn’t hunt small prey near her den, leaving them to her pups.
Explanation: Since "small prey" is plural (more than one), we use "them" instead of "it." This way, it means the mother dingo lets her pups hunt the small prey near the den.