What breed of cat do you have when it is all white except orange tail and ears?

That sounds like a Calico cat!

While Calicos are known for their patches of white, black, and orange, the specific pattern and color distribution can vary widely. It's possible your cat could have a pattern where the orange is primarily concentrated in the tail and ears.

Here are some other possibilities:

* Dilute Calico: This is similar to a calico, but the colors are toned down. Instead of bright orange, your cat could have a lighter, cream color.

* Orange Tabby with White: Some tabby cats have white patches, and if the white is dominant, it could make the orange markings look like they are just in the tail and ears.

* Other Breed Combinations: Some breeds like the American Shorthair and the Maine Coon can have similar color patterns.

It's important to remember that color and markings aren't always a perfect indicator of breed. To know for sure, you could consult a veterinarian or a cat breed expert.