I have a well trained(obedience schooled)9 year old BC with no previous behavior problems. She has recently began growling at me if I get near her food while she is in a sit stay.I always make her stay while I am fixing her food and then only let her go to feed on the OK command. She has NEVER growled at me before and does not do it to anyone but me-her primary owner/trained/caretaker. She has never bitten but I fear this is next. She is well behaved in all other areas. She even lets the 12 year old take her food away, and put her hand in it while feeding, and never reacts to it. I have never let her be possessive of anything before and not sure what is up with her now.I have done all the usual things like taking the food away,putting her in a lay down or submissive position but she still does it-HELP!!

