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.
I am going to disagree with one fact listed here. You state that rosemary is ok for dogs, and I strongly disagee with that. It infuriates me that they put it in dog food. The argument is that it is not rosemary extract, but rosemary oil that can bring on seizures in dogs if you dog has a compromised system.