This is in the "why didn't I think of this" category. After all, there are BABY-CAMS. When I go a way for a few days, I sometimes take my dogs to Camp Bow Wow in Agoura Hills because they have a "Camper-Cam" where I can see the dogs in real time. It's reassuring to see their tails wagging rather than imagine that they are depressed and lonely.
Now I can be sure that my horses are safe, have their fly masks on, have plenty of water, etc. etc.