Oh DD dear,
What have we here?
Have no fear,
Help is near.
Super Mum proceeded to free up the squares and sort out the ones that hadn't been eaten from the ones ...
... that had.
She clicked her little scissors and SHOWZAM - look at that - 81 squares whole and 19 squares partly eaten.
The blanket will be one round smaller.
Now for some more magic. With nimble fingers and trusty hook she took those 81 squares and worked merrily away. It will take some time but she'll get there and the Cat (perhaps not the Rat) will have a nice, cosy bed once more.