Well Maureen you and I have talked about Cassey for many Months. I know what you have been though at least in that time.
I know between you and I we have came up with Many Many *Jobs* for her.
The others here have had some Great Advice for you. Not all but Most we have talked about.
I really think it is Best for Cassey and for your Yorkies Safety to let her go. I Really hate that I really do but
God bless your sweet heart you have Tried Everything.
And as for the Search and rescue or Police dog work.. she is to old.. the start training them Way young.. and the retire at about Cassey's age.
She may do well as a Therapy dog though
.. You know I am here for you hun.. I wish I was closer to help you more ((((((((HUGS)))))