you may want to point out to your principal that federal law recognizes poor behavior as a valid reason for barring even a "real" certified service animal. (see the link to the ada guidelines above.) even comfort animals can be removed from public housing over that issue per the fair housing act, which is much more liberal than the ada. any dog that snaps at people does not belong in public - and especially not with kids. wow, your fellow teacher has amazingly poor judgment. if her dog bites someone, no certification is going to protect her from a law suit.Fortunately she doesn't work with students. She works with staff. I believe the principal is about to "invite" her to leave the dog at home. I'm just a bit concerned that it may turn into a blanket policy banning all dogs. Tori is a dream and the kids love her so I hope we don't get caught in the fallout.
best of luck.