The dog kept in the shop downstairs in the rental house is very noisy at night. What is the most effective way to complain?

Look for a property first. Generally speaking, this kind of thing is managed by the property. If the property can't be solved and coordinated, it will still be reported to the police as a nuisance. Although there are many dogs, they don't bark much at night. There is still too much noise at night. If there are elderly people living around, you can ask them to complain to the property together, saying that making noise in the middle of the night may be more efficient and will affect the health of the elderly.