Hmm, that's tough. I'd probably just move breakfast time until after everyone was awake. Are they barking while they're eating, or while they see you getting out the food? We were doing nothing in life is free with Gage, so he always had to sit quietly and wait before he was allowed to take the food back when we were feeding him on a schedule. But if they're barking while they're eating, that wouldn't help, of course. Do your dogs have crates? Maybe you could let them out to eat one at a time.