Two Weeks, Two Collars
I'm really not sure what to do about this problem, besides taking Siri's collar off whenever she's in the house. It's been awhile, but I've had dogs escape from the house before, by pushing open a door that wasn't completely closed, or by rushing past someone who was entering or leaving, so I'd prefer that she wear a collar all the time.
The second collar was soaked in Bitter Apple and allowed to dry over night. Apparently, Brea doesn't notice or mind the taste.