Litterbox issues are definitely a sign of stress in a cat. It can result from a change in routine (like you being away), a medical issue, etc. It usually resolves eventually if/when the stressor is removed so hopefully if it's due to your trip he'll get back on track soon.
In the meantime, Cat Attract is definitely an option. If you think he can still smell where he's gone on the floor, also try an odor remover if you haven't already. I've used both Resolve and Nature's Miracle with good results. Sometimes a deep clean of the litterbox or even replacing it if it's plastic works. When one of my cats had a couple incidents with pooping right outside the box, a total refresh/good scrub solved the problem. If none of the above helps, it might be worth a call to your vet. Good luck! |