We had a St. Bernard with it when I was growing up (12 years old) she exercised but did not exert herself. If we broke out the trikes (they didn't have quads back then) she had to go inside because she loved to chase us when we rode and if she did it would hurt her. So I am not sure if it applies to small breeds or if things have changed since all of the years have passed (too many years

) ~ but exercise was great, non strenuous & no exertion ~ just to keep limber.