Very nearly there now! I've been putting in the hours and have finished the left had side.
Here's part of it, to the top of the dog's ear:
And the rest, joining up with the strip along the top:
It seems to be catching the light slightly differently in the photo - I suppose I must have been stitching at a slightly different angle or something. It looks OK in real life, anyway.
Just the pointy bits to do now, then the sewing is finished.