Well, they're definitely more at risk than other breeds, even without the barrel chest, but yeah, it sounds like you know the signs to look for and how to help prevent it so I'm sure Luna will be fine. And don't worry, I've never heard of a submissive CsV
Smaller than a GSD?? What makes you think that?? Flint is 27" at the shoulder and last time I weighed him, was at least 100 pounds. I know females are significantly smaller, but I remember Shetan [Flint's mother] was larger than my GSD as well. I fed my GSD Royal Canin but the main meat sorce is chicken so it's no good for Flint. I feed him either lamb & rice or venison & rice formulas. And I feed him at dinner time right before bed when he's not too active [though he gets pretty frisky when he hears the dog food cupboard open.]