Catcoons don't attack Wurt

This is by design, as far as I know. Wurt is not a monster; she is a merm. Pigs hate merms, and merms hate pigs. You can tell she isn't a monster because you can still interact with Bunnymen just fine.

Yeah but still she is a walking fish after all and if they dont attack her by design then thats overlooked.

I've never had any problems with cats, they've never tried to rip my face off and i'm fine with it staying that way.

As mentioned above, merms are not monsters. Catcoons and merms will not fight in the wild. Her Catcoon inspect strings will probably be adjusted in the next update.