I know for someone who is frightened of dogs that hearing the above statement is not very reassuring, but if you are coming to my house every day to do my gardening and you can't be bothered to set a fixed time then you are just going to have to get used to my dog.
My dog doesn't bark when you ring the bell, he lets you in the garden with a glance and walks off back into the coolness of the house.
Every time they deliver the water on a Tuesday morning at 10am we have to go through the same routine. Every time a repair man turns up, today it's the air con service and there are 3 of them, we have a palaver of the dog not biting them and while we are having this discussion, my, so obviously not a guard dog, wanders off leaving me with 3 strange men in the house.
But what winds me up the most and it happened in South Africa as well as here in Dubai is when I go dog walking.
Bob is on a lead, when I see someone I assume they may not like dogs, so I pull him onto a short lead, either a) cross the road or b) walk between my dog and the other person.
He never pulls on the lead to explore them, he never barks at strangers, he just carries on walking while they, hop, skip, scream, run away (in one case the other evening into the path of an oncoming car) yelling 'don't let your dog bite me'