Hmmm yes any booger who is near our feline friends at any time has the fear of what happened to ur man's stick close at heart that I can assure u

I have like 4 boards which I keep faaaaar away from any cats reach cos it happened to me once and I swore NEVER AGAIN!!!
There's not much u can do about it really with regards to repairing it I think.
If its not too bad then it'll just look like he was/ surfs hardcore reef breaks and he has lost his board to the rocks a few times
If it is bad and he cant stand the site of it then u'd basically need to get a new board hey

Cos The materials are heat laminated & fused together so that each segment of the board is joined to the other where need be.
On the other hand u could argue that the damage is just really cosmetic and that the board wont perform any less

Also the indentations would also make the decks grip better, like tread on tyres LOL!!!
Just add a lil wax.
Bummer I know.
If anyone else knows of anything that Im not aware of then let the lady know!!!
All the best.