Here are the rules if you want to bring in food:
Containers and Coolers
Hard-sided coolers are not permitted into Dodger Stadium. Guests may bring in soft-sided coolers that do not exceed 14 inches square and must be stored under the seat. All containers and coolers are subject to inspection by stadium personnel prior to entering the gates.
Contraband - Items Not Allowed in Dodger Stadium
Contraband items not allowed in the stadium include: glass bottles, cans, weapons, poles, umbrellas, backpacks, 14 inch or larger purses or bags, coolers, thermoses, beach balls, inflatables, banners, signs, flags, use of laser pointers, firecrackers/fireworks, boom boxes, air horns, whistles, musical instruments and pets.