We ALWAYS use expens. The amount of free space they have, and in addition the potty area, is most important for potty training. The laundry room will probably be too big to start with. To us, no accidents on the floor is the right number. With a single 10 week old puppy we will even fold the expen in to a 2x4 foot size with a litter box in one end. They naturally don't want to soil their sleeping area but will go a few feet away. We use this instinct to start training pups as soon as they start toddling around. They don't stay in the expen all the time. Just when they can't be watched all the time, to sleep, to eat, and to potty. The best incentive of all for them learning to "go potty" on command is to go over beside the box or pad end and say "go potty" stoically and with no other postive reinforcement until they do. Then pick the pup up and make much over it and let him/her out to play for a while. These are very smart dogs and they learn quick that going potty on command brings happy results. No baby talk before going potty. Of course it works best when you know they have to go-like right after they wake up. I can have a 10 week old pup squatting on command, even if it doesn't have to, in 2 or 3 evenings. Potty training comes before house training. To me leaving one loose in a room, even a small one, is asking for house training before you have acheived potty training. JB Pets has the best price on expens. We use the 2' ones for puppies which are easy for people to step over if needed.