I was looking through photos last night and found that I had taken some good pictures of the repair but never shared them! This was a local sewing shop; when I took the blanket in the owner immediately knew what she was looking at - apparently her in-laws have horses!
Here's what it looked like post-rip, pre-repair:
And here's the repair:
They did a really, really nice job. It was a fairly complicated fix in a number of different ways. Total cost: $47, far less than a new turnout would've been!