Can you identify what's in these x-rays?

Hints: dog; no, these didn't "pass"; can be caused by improper diet;

More difficult to view: stray cat; not caused by what was eaten

The first x-ray was of a dog with bladder stones:

The second x-ray was from a stray cat which had been brought for a dental cleaning and was found to have been a victim of a pellet gun sometime in his former-life.