Just as nutjob Christians shouldn't be pharmacists and therefore allowed to decide whether or not to hand out contraception or morning-after pills, other nutjobs shouldn't be in professions that present day-t--day situations that could conflict with their beliefs. You can't fire someone because of their religion, but you can say at the interview, "This job entails picking up dogs, yada yada yada, if you don't like this, take a hike," or something to that effect.