She is rather possessive.

We like to give our dogs pig's ears to chew on. We bring out two fresh ones at a time, one for each. Typically she'll hide hers somewhere, then find and take the shih tzu's, though she never gets physical because the older dog is so submissive she just lets her take it.

In these cases we just recover the "hidden" ear and give it to the older dog. Our papillion doesn't seem to care.