Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to house train your dog quickly [title] Get rid of residual odors in your home. [step] Before you start your house training plan, you need to ensure that your home is free from urine stains and residual odors. Once you've gotten rid of any odors and stains, your dog will not be attracted to certain areas of the house to use as a potty.

Ending1: Just make sure your home is totally clean before you start training your dog. Be sure the bathroom is running clean and free of litter. Ending2: You'll also need to use any furniture that contains urine. The stains and odors coming through a toilet should disappear after a few hours and be eliminated quickly. Ending3: Anything that smells rotten or spoiled will likely be avoided, as these odors will either be removed or previously mentioned. These smells can be noticeable no matter what time of day. Ending4: [substeps] Purchase a black light and a pet odor remover from your local pet store. When it is dark, turn off all the lights and thoroughly inspect your home, floors and carpets, and furniture.

Answer format: ending1/ending2/ending3/ending4