I'm sorry your dog put a hole in your beautiful quilt! what a naughty thing! Here's how I would fix that spot: make another block , matching the pattern/ fabrics as best you can, do the same with the backing, cut it 1/4 inch wider on all sides, and applique it to the quilt with a new piece of batting in between, I'm sure you would be able to re-quilt that small section at home. I've had to do this myself. Good news is your quilt has enough movement/ color in it, I'll bet you'll be the only one that will notice; and at some point you'll laugh about what a naughy boy you had. Good luck