My name is Essie!

My boyfriend's dogs had puppies this year before he was able to get them fixed, and he has found homes for all the puppies except for one.
I am reaching out to a bunch of local shelters, (as I know that most if not all of them are probably full) in hopes that one will have availability/an opening for a young female dog, as well as posting here.
Blue heeler / great Pyrenees mix.
She is under a year old. She is up to date on shots but not fixed. She is in heat for the first time and I'm scared she will get pregnant before we have time to get her fixed and rehomed. His female dogs are fixed now but not our male dog (her dad)