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I would refer to the food rules found in this section:
http://www.selfhelpdogtraining.com/PackStructure/cms/PackStructure.html
Sounds like Kaila is concerned that Stitch is the alpha that will take the food, so she guards it until she is sure he is not interested.
My guess is that this is from past experience of the dogs checkinbg out each others bowls and other non-related pack structure things going on in the past in particular where she doesnt realize that you are the only one who will take food and wouldnt allow stitch to take food.
My suggestion is to completely seperate them with a barrier when you feed them for now or even forever if you have growling going on.
Sometimes management is easier with multiple dogs.The other options is to teach a good “leave it” to practice if any of the dogs approach the others bowls , even if there is no food left. These kind of exercises gets to the heart of the problem but wont work unless it is an all or nothing thing with the leadership things.
Her growling is a reflexion of her insecurity in the situation and that she feels the need to guard the food. So either way should fix that.
