"The area spreads over several kilometers and while it's a well trod path there are lots of twists and turns and there are times when it's pretty quiet," he says.
There have been frequent complaints that Hong Kong police do not take the killings seriously enough, although the force has devoted considerable resources to the case, at one point drafting in a Swedish pet specialist to profile the serial killer.
Lea, a long-term Hong Kong resident, fears the poisonings are now beginning to harm the city's image.
"It's been going on for a very long time now, far too long, and a lot of animals have been killed or injured," he says.
"But it goes further than the killing of innocent creatures. The Australian Chamber of Commerce recently published an article on living in Hong Kong that included a warning about the dog poisoner.
"When you get that kind of thing it starts to reflect quite badly on the place as a whole."
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