was closing up around 7:30 and walked around the back of the shop (open awning) to wash my hands and a pit mix was right there and starts aggressively running up on me barking. I grabbed the trashcan and put it in front of me, dog stopped, growled and circled around. The front door to our paintbboth was open so thought id get it in there and lock him in. Got him to go in but he got sketchy so backed out I went in and shut the door. He was jumping up and was afraid hed come in where the filters fell out so went and sat in a truck that was in there and called police. Was in there about 30 minutes waiting. They came and took the dog back to the owner. I was and am still mad. Had my 6 year old daughter at the shop today outside playing and that could have been a disaster. Our painter said its been prowling around but this is the first close encounter.