He may not be very big, but he's death from the ankles down when some stranger steps onto the property.
He also has a severe herding instinct. When it gets dark out, it's time to move people into their bedrooms. It's most annoying when they don't cooperate. However, once they finally get where they're supposed to be, he faces the doors in case anything happens.
At dawn, it's time to rise and shine, so he shakes - which rattles the tags on his collar. If that's insufficient, he jumps onto the beds and begins digging people out from under the covers.
Keeping track of everything is his job, and he takes it very seriously. There is a time for sleeping, a time for waking - and oh yes, a time for feeding the Guardian of the Property.