Johnny,

I guess i understand your situation,wher do u live by the way?

In my case, what i exactly did was- i met the owner of the dog directly , and spoke to him.Advised him that his dog is dangerous and have even bitten a boy in the neighbourhood.He did not seem to bother and in fact , he still leaves his dog running loose.
I have lodged a police report, and have submited to the DBKL-( its in Kuchai lama).Normally if u have lodged a report, the police will go and have a talk to him, despite the advise, if he still lets his dog like tht, than its best tht u complain to DBKL.