So the first night that Mimzy had his Pen-G shots (about January 29) we spilled enough on him that I couldn't get it washed out and decided to trim some fur off his back to be sure he didn't ingest any of the medicine. I trimmed down to the soft white undercoat in some spots. Here's a pic.

So that's a little over a month ago. And it still looks like it hasn't grown back. How much longer do you think it will take before this spot looks normal again?