[header] How to catch a rodent in your house [title] Determine what types of rodents are in your home. [step] Determine rodent type based on the rodent dropping you find. Mice droppings are a ¼ inch long with pointy ends, and rat droppings are ½-¾ inch with relatively rectangular or sausage like shapes. 
Squirrel droppings are roughly 3/8 inch with rounded edges, and can be recognized by the fact that they lighten in color over time. [title] Determine which type of rat you're up against.