Our dog Duke has always been fine eating around our other dog since we've gotten him. Now recently he has started to act crazy when its food time. He won't eat his food until he checks out her food and she even looks at him or moves he lunges at her and starts going after and he continues this for atleast 15 minutes after they've eaten. I've tried seperating them and he still wont eat his food just throws a fit whining barking knocking his food over wanting to get to her food. He'll finally eat after he finds out shes dont but if she even goes near the place he ate at he'll go after her again and shes a 90 pound rottweiler twice his size HELP!!!!