OK, folks, we had to use the 'thunder shirt' several times in the last three days due to back to back NASTY thunderstorms.
The first night, we woke up to a storm because Willow was sitting on our heads (as usual), shaking so hard you'd think her muscles would have to hurt. I got the 'shirt' and wrapped her in it. She did keep panting and shaking, but not 'quite' so hard and she was contented to sit and/or lay by the bedroom door for the duration of the storm (which was quite lengthy). Woke up her snoozing soundly at the bottom of our bed.
Next night, another storm. Came earlier while I was watching TV. Put the coat on her as soon as I (and she) heard the first 'booms.' She was still somewhat panty and shaking, but laid quietly at my feet.
Last night, noticed some lightning when retiring and put the 'shirt' on ... knew there were storms out there, but wasn't sure how close they'd come. Woke up to a HUGE thunder boomer. Looked for Willow. She was laying quietly on the rug beside my bed, not panting, not shaking. She was still alert to the storm, but her anxiety level was SO much better.
So, I give it a 'thumbs up.' It's not a miracle cure, but it definitely reduces the anxiety level, which is a 'win' for me (and Willow).