Provided that they are made from kosher beef, turkey, or chicken, hot dogs can be kosher, and kosher hot dogs are widely available for sale. Franks made from non-kosher meat are not kosher, so only those with kosher certification may be consumed. In addition, even kosher hot dogs must be prepared in a kosher kitchen in accordance with kosher laws in order to retain their kosher status. As such, if you wish to buy a cooked kosher hot dog, checking the package is not good enough. Make sure that the establishment is under rabbinic supervision, and then enjoy your treat (with lots of kosher ketchup and mustard).