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My big dog (probably mostly Giant Schnauzer) has developed stiffness in his back end that makes certain positions somewhat uncomfortable for him - he'd rather lay down than sit, for example, and it'd be mean to ask him to sit up to beg. So I just don't ask for such commands unless I have a really good reason to.

From your pic it looks like both your dogs are pretty big, which means that at age 5+, they might be starting to feel those aches and pains of middle age. It's possible that rolling over just doesn't feel great anymore, even if there's nothing WRONG wrong.

 

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Sure. They're cuties, by the way.

I'm just thinking...I'm heading into middle age myself, and you'd have to either scare me or offer me a very nice bribe to make me, say, do ten burpees, lol. And that's with me knowing the value of exercise.