Keep in mind, though, that this approach will only work for mild cases of separation anxiety because highly anxious dogs usually won't eat when their guardians aren't home. (pets.webmd.com)
Sounds like as mild case of separation anxiety, you need to work on it before it gets worst, here is an article: (pethelpful.com)
If your dog isn't showing signs of anxiety during brief separations of about 10 seconds, you can start incorporating the counterconditioning methods we have suggested above for mild cases of separation anxiety. (mypetneedsthat.com)