Multi-choice problem: Continue writing the next sentence in this paragraph:

How to protect floors from dirty dog paws
Place doormats in front of outside doors.
Purchase doormats for all the doors your dog goes in and out of. Use large doormats that have bristles that stick up.

Choices:
(1). You may need to purchase small ones to make sure they will not get on the dogs toes. Ensure your doormats are secure and not tape your dog's paw to the door.
(2). That way, they will collect dirt off your dog's paws as it is walking inside. Replace your doormats as they age and become less effective.
(3). Adjust the length of the handle so that you're able to cover the entire floor. This way, your dog can't jump out or into the room, much like an adult could.
(4). These will protect your exterior doors from the stress of scratching or tunneling outside. You can also cover your doormats with wooden picture frames or wooden slats to protect your interior doors from persistent scratches from a dog's paws.
(2).