In my multi-pet home, my cat ate a piece of cooked plain squid but my other cats haven’t; should I give the same to the others and what should I watch for?

Yes, cooked plain squid is safe for cats. Just be sure to cut it into very small pieces because the texture is tough and could cause choking. Offer only a small amount and monitor them for any signs of gastrointestinal upset. If you notice vomiting, diarrhea, or difficulty swallowing, call your veterinarian.