Lost dog?

This dog is sitting out front of 4240 21st st. 6:40 pm friday 5/8. Cross st Eureka. It doesn’t belong to the tenants or their neighbors. Is aggressive when we approach so we can’t corral it to look at its collar but doesn’t appear to have tags. I believe female, black harness, blue collar, about 30 lbs. I’ve alerted animal emergency services and they said they’d send someone out.