Stop a rat infestation easily with this step by step guide. When you notice chewed up bits of paper and little black things the size of large seeds, you knwo you’ve got rates! You detect a sweet, slightly sickening scent. You may even see bits of torn out fur, paper and shredded fabric with a hollow in the center. Your cat stares for hours at a hole in the baseboards. Your dog barks and scratches at the wall. You hear scrabbling and squeaking. By the time these signs appear, you already have a problem, but it can be fixed quickly and easily with a little effort. Read on to learn how to prevent rodent infestation.