I feed BellaMia a premium dry food, Merricks. I supplement that with fresh fruit and vegetables , salmon, chicken or a spoonful or so of Merricks wet food. She has no problems eating any of this. I'm seeing a lot of choices for "grain free" with Merricks and other brands. Is there a benefit to grain free or should I just keep giving her the regular? I'll need to buy another bag soon so I thought I'd ask here first.