It looks like Slug/snail damage...poor plant....I think spraying with neem oil will make the plants less attractive to most pests generally. I believe there are pellet like bait products available to kill slugs too but some are toxic, so not good for your cat. Putting beer out for them attracts them for a drink and kills them. I know this is silly but putting things on/around the pot can help keep them out like hair, lubricant on pot rims, crushed egg shells, diatomaceous earth because they can't climb on them and they may die.
It looks a lot like pet bird damage too. I'm not that smart with pest control though...