Depends on land area. Normally for terrace or link house, max is 2 dogs per house. For semi detached, max is 3 dogs and bungalow around 4 dogs. 6 dogs is way above limit and if neighbour complains, enforcement will take them away if without license. If with license, they will fine the owner.

i think if you can prove that your neighbor's dog is disturbing, you can ask authorities to come investigate.