In our old house, we had a rat from hell. Chewed holes in between cabinets in a island and chewed the drain tube for the washer. The water on the floor was how I found the holes from cabinet to cabinet. Traps set upstairs and in the basement. No luck. Few weeks later, dishwasher wouldn't work. Prick chewed wires. Added hardware cloth under and throughout the entire dishwasher. Still couldn't catch the bastard. I was home during a rainy day, and heard him in the dog food bag. Set up with the pellet gun, and a hr later I had my chance and missed. Left one chewed hole under the cabinets open open, and left a trap there, finally after almost a month of trying to kill this thing, he messed up and the trap got him.
Called him Rat bastard. Thing had a PHD in pissing me off. But I won't the war.