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My wife and I foster cats for a local organization and we have also several of our own.  We have a screened in back porch and the cats like to go out and get some fresh air and watch the birds and squirrels.  But at night when it is time for them to come in, there has been a few times we thought everyone was inside and they got left outside over night.  Not to worry, they do have food, water and a few litter boxes out there as well.  My wife started putting their names in a notebook and trying to keep up with them that way.  Then an idea hit me.  Make a tablet with toggles that go from red to green.  I made ours white because we were using white labels on it.  I was going to add the names on it with the slicer but when one of the cats gets adopted then their name would be permanently on it and I wouldn't be able to add a new one.  I made it with 15 toggles.  I can make more with less if requested.   

I glued the top and bottom together for this model.  If this item looks to be of interest to others, I might make a version that the top and bottom slide together for attachment.