Broken wheels on dishwasher racks

The plastic wheels on the upper and lower racks keep breaking. The latest casualty was also chewed up by the dog(s). They just pop right on the posts, a simple 2-second fix. I ordered the parts on a Tuesday morning, standard shipping, and they arrived FedEx less than 24 hours later. They came from Peoria, and I live about 1 hour away in Bloomington. Very pleased with the service. Will order from PartsSelect again if I need parts for any other appliance that I can fix myself.