Question

Processed foods, like a hot dog, must be heated to what temperature after removal from the package and prior to service:

Answer 1

Most processed food has been cooked before putting it into a package. So the answer of this question is you don't have to heat it.

There is a low chance of contamination of bacteria but it probably harmfull to those with risk factor like weak immune system. In this case, you can heat the food at least 60°C (140 °F)