Upvote:3
I'm really struggling to understand what you're asking here. It seems like you're asking how to avoid dogs.
TSA can utilize whatever methods are approved for screening and to reduce wait times. Whether it be letting dogs go through groups, waiving groups over from the regular to pre-check lines, skipping people out of the body scanner to the magnetometer, etc.
Dogs can be trained to detect explosives and drugs and fruit and ... whatever else they want to screen for. You don't know what they're checking for.
So if you're in one line, and they pull out a dog, and you switch lines? I'm going to flag you for extra scrutiny.
Edit: Undid edit for 'waiving' as the word choice is correct- waiving as in 'bypassing'. Waving is correct too given moving the group over, but I was looking for 'bypassing groups' instead.