L.A.
Yikes.. not much you can do.. I am not even sure if dry cleaning is going to work..
You can spot clean the fabric, but if the urine penetrated the down inside, not sure how to clean that,, There are 1000's of down feathers per square foot.
Even hanging it out side in the sun, will not take away the odor.
Is it stitched into squares or is one big pillow? If stiched into squares, if the dry cleaning does not work, you could consider patching it on the squares where he wet it,