Lost Dog in Concord: Help Find Junior!

Hi my dog is missing. I left him at my apartment on San Miguel and toga st in Concord. I leave my back door cracked a little bit for him to be able to use the bathroom and when I got home he was missing. I left for work around 12:30 a. M and came back on my break to check on him at 4:20 and realized he was gone. His name is Junior and he isn't wearing a dog tag. He has a black harness and collar on. He's blonde with darker golden ears. Hes some type of terrier I believe. This photo is before he got his hair cut. Please if you can help me find him. 9257524984 thank you so much.