Originally Posted by djclare
Also, if I patch on top, do you think I can just leave the rough edges underneath?
after patching the back in whatever way you like,
i would create a new patch out of four pieces. those pieces would be the equivalant of the flower-dot-flower-stripe area. put those pieces together with 1/4" seams. fold under a 1/4" seam allowance, just as there was originally, around the whole thing. put this aside for now. carefully trim around the worst of the chewed area. leave as much as you can, but rough edges won't be a problem at all. that's your structure, but remove the lumpiest parts if necessary. pat in the new batting, gluing into place if you want to. carefully place the new patch into position again using glue if you like. now hand sew with an invisible slipstitch. you may be tempted to use invisible thread, but i wouldn't do it. it will feel different than the rest. whn the patch is in place and sewed down. you have to machine re-sew the quilt stitching. the patch will disappear into the busy pattern.
try dabbing some perfume onto the quilt that the dog doesn't associate with you. he may be less likely to feel at home there. i used to do that with my cats.