Waltham Pest Control came within a few days of my phone call of distress. Rats are the hardest rodents to control, once they have burrowed in the backyard. We have dogs and a grandchild, and putting poison in the burrow was not an option. Waltham Pest Control laid down five rectangles with poison within that only rats can get to and then hopefully die elsewhere. In a month, Waltham Pest Control will check out how much poison is gone, and make further recommendations.