No, no, no! ANYTHING that has a significant fat content (like whipped cream) is NOT good for dogs, because it can trigger pancreatitis.
Another reminder to EVERYONE. Your dog isn't missing out on a Thanksgiving dinner. PLEASE DO NOT give him something he doesn't even miss. There's a reason both my vet friends call this 'pancreatitis season.' Giving dogs human food is potentially lethal. They're not made to digest gravy, mashed potatoes, etc. PLEASE, PLEASE be kind to your dog and give him only dog food for the holiday. Pancreatitis kills.
Viralmd, Cyril (aka Aljac Captain Hook CGC) and Tassie, the rescue chihuahua