My 4 yr old Corgi, Sandi snapped at my 19 mo old for the first time when she got to close while she was chewing her bone. Anyone have any ideas on how to stop this before it turns into a bite? She's never been food agressive before, so I'm not sure what has started this. My daughter used to crawl around her while she was eating but not sure why its starting now.

Any input would be very appreciated!!!