It's all about conscience. When an animal I know is missing I've been known to hunt for weeks. Recently a kitten wandered off (unknowingly to me) and I never found her. To this day I still think of her and my heart sinks. I feel like crap just because I didn't see her go out or find her. Problem is I now live in the woods, and there are plenty of predators. But the fact here is my conscience... it hasn't let me rest. They NEED us to take care of them! Food, water, clean litter boxes... if they don't have those basics, it's like living in squalor, and I am so not about to let that happen ever to any of my family, especially the furry ones! To this day I call out just in case she's within ear shot, despite the low odds of ever seeing her again.