Half and half is simply half whole milk and half cream. In the UK, they call it half cream. According The Kitchn, half and half typically has a 10 to 12 percent fat content, which, it stands to reason, means it's less fatty than cream and fattier than milk.
Dogs can eat peas safely. Peas are a good source of potassium, zinc, iron and several vitamins. Depending on the size of the dog, 1 or 2 tablespoons of peas is recommended. The dietary fiber in peas also helps overweight dogs feel full thereby reducing the dog's intake.
Also no corn as I'm sure you know. Carrots, green beans, apples (be sure to remove the seeds and peel them), broccoli, peas, collard greens, mustard greens, turnip greens, sweet potatoes, berries (blue, rasp, straw), orange and pears are all ok to feed your dog. Hope that helps! I would stay away from meats and fast food obviously.