Ordered new dogs to replace the old ones when I took out the agitator assembly one of the dogs was broken there are four in the unit this is what was causing it not to turn when I discussed this over the phone with the gentleman who answered the phone to help me is very knowledgeable; personable, relatable, helpful and friendly. He gave me good honest information about how often the dogs need to be replaced and if anything else needed to be replaced or not. I put it back together and it works like a new machine.