Well, not all dogs are playful. My little old Shih Tzu isn’t much of a player and I don’t think she ever was. Occasionally she chases Chester, or runs from the camera, but that’s about the extent of her exercise.

Of my other two (younger, 4-5), Millie could go for hours. Chester will play just a couple of minutes and then he’s done, although on warm days he’s much more active.

If she's in good shape and isn't overweight, I wouldn't worry too much.