Something is cutting leaves off our plumerias leaving a stem of 1-2" and completely consuming or carrying off the leaves. What?

Slugs, caterpillars and snails are common plumeria plant pests. Portions of the plant stem will have been chewed away and slime trails may be visible near the plants. They can hide under leaves, under the soil and rocks. Diatomaceous earth is a good choice for treating plumeria pest problems such as slugs and snails. Spread it on the soil/ground around the plant.

Thanks, Luis. I will check it out. Just didn't think slugs or snail could make and entire leaf completely disappear!

That really is a mystery. Do you have cats who might break them off and carry them off to play?

I assumed that you would have noticed the dog/cat damaging the plant or noticed a dog/cat/pet getting a case of dermatitis or an upset stomach. Is the plant inside always as seen in the picture?