It can be incredibly annoying to hear a neighbour dog incessantly barking all day and night. It can also be difficult to know how to properly navigate the situation without offending your neighbour. Although it's uncomfortable, it's important to confront the situation so you have peace. Try to come from a calm place when you talk to your neighbour about his or her dog so you don't ruin a relationship with that person.
Make sure you are completely calm when you confront your neighbour. It's never a good idea to talk to them when the dog has just woken you up at 3:00 a.m Try to call the neighbour to schedule a sit-down so you don't drop by at an inopportune time.
Bring a peace offering with you. Some dog treats as well as cookies for the neighbour show that there are no bad feelings and that you want to help come up with a solution to the problem.
Offer solutions to the problem if your neighbour seems confused on how to stop the dog from barking. Tell him or her about collars that spray water onto dogs when they bark, or suggest a doggy door, so the dog isn't outside all day and night disturbing the neighbours.
Allow a reasonable amount of time for your neighbour to make improvements before complaining again. Training a dog takes time, and if your neighbour is truly trying to make changes, your second attempt at complaining could frustrate the neighbour.