Was bit on hand by an owners dog in a store. worried about possible rabies. went to doctor and was told nothing to worry about. i still am worried.

Impound dog: Probably not a rabies problem. Notify public health officials and have dog watched. If hand is infected, have PCP begin antibiotics.

Missing data : Was the dog up to date on vaccinations including rabies ? Are you in a region where your health department says there is rabies activity ? These are simple questions you can ask of those involved to confirm or exclude rabies as an issue. Your doc is likely aware of these factors. If you are still concerned call the local county health department for guidance.