When you get the feeling that you are being watched and turn around!
Yes, BHRR’s Miss Sleet(one of our three blind/deaf mice) cannot see me, yet she does SEE me!
She has excelled at her touch plus scent training. She can find her way in and out of our 3+ fenced in yard and can track me like nobody’s business.
She did not like that I had put an x-pen around my computer so I could study. I am coming up to three big huge finals and Miss Sleet does not care! 
Can you believe that she is now 2.5+ years of age! She is a true miracle…..she was the one that we thought we would lose first and she is still going so strong.