Mammals:
* Pigs: Their snouts are iconic for their roundness.
* Pugs: These dogs are known for their flat, wrinkly faces, which include a round nose.
* Bears: While not perfectly round, their noses are large and rounded.
* Elephants: Their trunks have a round tip that they use for smelling and manipulating objects.
Other animals:
* Frogs: Many frogs have round noses.
* Some fish: Fish like the pufferfish have round noses, which can be inflated for defense.
To give you a more specific answer, I'd need to know more about what kind of animal you're thinking of. What other characteristics does the animal have? Is it big or small? Does it live on land or in water?