i've had this issue before but it hasn't escalated to this point. i normally feed both of my dogs across the house from each other. layla, my 5 mo golden, normally scarfs down her food in 1/10 the time it takes lola, my 4 y/o min pin, to eat. after layla is done, we have to play the "keep her the heck away from lola" game until lola is done and i can pick up her bowl -- this can last up to 15 mins.
tonight, i made both of their dinners and set layla's down in the kitchen. i put lola's bowl outside of the kitchen on the opposite wall so layla couldn't even see her. layla finished first and went around the wall and stood their for 5 minutes watching her.
she then inched closer and started in on lola's food so i went to retrieve her. she didn't growl at me, but i directed her away from lola's food. the moment she passed lola, she lunged at her. lola scurried away squealing while layla was on top of her strong-arming. she wasn't hurt, but there was spit around her neck so layla obviously tried to bite.
my boyfriend pulled layla outside for time-out.
i don't know how to correct these situations. layla gets 2 cups of food a day so she is eating enough (5 mos, 30 lbs).
if anyone could give me some advice or guidance if they've had this problem i'd appreciate it.
also, someone give me some advice on how to suggest to my boyfriend he's being too rough with layla. he's a cat person and doesn't really understand dogs so i'm going through hell trying to train and re-train against aggression.

he's very obstinate when i tell him he's doing wrong. one of those.