Add the raw chicken breasts and hot sauce to the slow cooker. Cook on low for 6 hours or high for 3 hours, or until the internal temperature of the chicken reaches 165 degrees.
Shred the chicken breast in the slow cooker using two forks, and leave the chicken and sauce in there when done.
Add the cream cheese, mozzarella cheese, and ranch to the slow cooker. Cook on low for another 30-60 minutes, or until all the cheese is melty.
Turn the slow cooker off and remove the lid. Let the dip sit for about 10 minutes just to thicken up. Enjoy served with celery sticks or your other favorite things to dip.