You can please some of the people all of the time.
You can please all of the people some of the time.
But you can’t please all of the people, all of the time.
The OP’s change from 1st person plural (we need to sort out the problem) from the neighbour to the first person singular (I want you to control your dog) does hint to me that not only does the OP lack negotiating skills, they also fall into the third category above, as do some others.
If you choose to live among people, surely it is unreasonable to expect them to conform to your norms and values.
I would suggest that you go round and get to know the dog as I suspect you have done something to wind the dog up. My ex had dogs and I know that people who didn’t bother my dog wouldn’t get barked at. People who did, did.
I don’t have dogs becasue I don’t particularly like them, but I like to think I’m intelligent enough to recognise that I can’t turn my dislike of dogs into some kind of crusade preventing other people from enjoying dogs. I do have a dislike for cats though, it would appear that they do not discriminate when looking for a toilet and the mixture of children and cat crap is not a good one.
I hope the OP knows and controls where the cat is crapping before criticising others.