Hi Rowan,
I have a Rat Terrier that looks just exactly like your dog picture in her face & head...she has course short white fur & not much fur on her tummy but a lot of dark spots.
My husband has an Airedale again...his second one...& she is so different from our first one personality wise. She gives us loves but is a scardy cat when she hears unknown noises...especially if it is quiet in the house.
We have had lots of big dogs that were outside dogs & if they came in they had to stay in the doorway of the kitchen.
I have never had a small dog so am very attached to my Terrier even when she is bad....she gets a verbal "bad dog!" if she gets paper out of the trash can but she has to always come to me with her ears back to get a love from me and then she feels okay. :ghug
Please let me know if that is your Dog & what kind it is.
orchards