I live with and take care of my grandparents. They have two cats that they have always fed, but never pet. They are over ten and have always stayed here, but outside. One of them has allergies; she (Sandy) is always sneezing and sounds miserable. Since I can't catch her to give her a pill, I was wondering if there might be something I could put over her food that might help? I was thinking about grapeseed extract, but I didn't know if it would be OK for cats. It does well enough to reduce human allergy symptoms, and I thought it might help Sandy. Any opinions?