Re: My pet cats have no interactions available

@SerenaBay  Can the pets interact with the human sim(s)?  Try that for a bit and see whether the interactions from the human side come back.

If that doesn't help, or the cats can't interact with the human(s), go to Edit Town and evict the household, then put them back in their house.  This will preserve any jobs and relationships but remove promised wishes and opportunities.

If that doesn't help either, and this is a new save, you could try starting another new save instead.  The household you created will still be available in the in-game bin, when you've first loaded the new save and are choosing whether to create or move in some sims.