As a tradesman who does regular work on Unit sites I can only relate my experience to you. We have had situations where we were contracted to do jobs for owners and other owners would complain over the smallest matter. We simply would say to them that if they had an issue then they should talk to the owner and not bother us. We would continue working untill told otherwise by the person who contracted us. I would tell this person that they should get a life and leave the tradesman alone. It might be an idea to also ask the tradesman to leave his dog at home. If this is a regular source of work for the tradesman then I don't think you will lose him over a dog.