Preheat the smoker to 185 degrees F.
Prepare the hot dogs by scoring the skin with a knife in an “X” pattern about ¼ inch deep.
In a pan or baking dish combine the BBQ rub and ground mustard seed and whisk until combined.
Then roll each hot dog in the rub mixture.
Transfer the hot dogs to the smoker and place directly on the grates with the scored side up.
Close the lid and let smoke for 1 hour.
Meanwhile prepare the relish by adding the pickles, onion, red peppers, and pickle juice to a bowland stir. Cover and refrigerate until ready to serve.
Then lightly brush the top sand sides of the hot dogs with the BBQ sauce.
Raise the temperature of the smoker to 225 degrees and let the hot dogs continue to cook for another 25-30 minutes until heated throughout.
Top with the relish when ready to serve and enjoy.