NYC should contact a Rat Terrier Club in the area. I believe only a couple of these dogs were bought by and ' employed' by those in charge of the stores of grain in Egypt. ( They had reached the maximum amount of 'poison' that they had been using on the grain.) Within days, they had it cleared out of rats. As the terriers spent their off time with their handlers and families, very soon those neighborhoods were also devoid of rats. As an aside, the dogs were taught not to eat their prey, thus safeguarding them from contracting whatever disease the rats may have been carrying.