Which animal does not have a horn?

This is a bit of a trick question! There are many animals that don't have horns, but to give you a specific answer, here are a few examples:

* Dogs: Dogs are mammals and don't have horns.

* Cats: Cats are also mammals and lack horns.

* Birds: Birds are a completely different class of animals and don't have horns.

* Fish: Fish are aquatic animals and don't have horns.

Let me know if you want to play another animal guessing game!