Is it ok to open the sliding door / windows for my indoor cats to get the "freshies" (fresh air, sights, smells and sounds of the outside)? Coco and Wittle just love it when we do that for them. They go out with us (supervised and in harnesses) when it is warmer out, and they love that too. I just worry that maybe this is harming/causing them frustration to do this. I don't want them to be developing a taste of what it would be like to be an outdoor cat. Does this even make sense? I love to make them happy, and they love to get their freshies every morning. I only hope they are not dreaming of what life would be like on the outside, and that they don't feel cheated in being indoors *99%* of their lives.