Ideally, the clothes that you put in a washing machine will come out cleaner after the cycle has finished than when you put them in. If you have a pet in your home, this may not always be the case. Fur has a clingy nature that causes it to adhere to most surfaces, including the walls of a washing machine. If dog hair has built up in your machine, you can remove it before washing your next load using items found around your home.
Wet a paper towel so that it is damp but not soaking. Beginning at the top of the machine and working to the bottom, wipe around the cylinder. If the dog hair is damp, it may not adhere to the paper towel, but you can gather it into a pile and pick it up completely with a dry paper towel.
Rub the cylinder of your washing machine with a fabric softener sheet if the dog hair is dry. The hairs will stick to the dryer sheet. Use as many as necessary to remove all of the dog hair.
Run the washing machine's rinse cycle with the cylinder empty. This may completely wash the dog hair out of the machine, but you may need to couple this method with the paper towel or dryer sheet method.
While running the rinse cycle on your washing machine, you can add one-half cup of baking soda to the cylinder for a more thorough cleaning.