Washing dog

An eight-year-old boy walks into the local grocery store and picked out a large box of laundry detergent. The grocer walked over, trying to be friendly, and asked the boy if he had a lot of laundry to do. "Oh, not laundry. I'm going to wash my dog," said the boy.
"But you shouldn't use this to wash your dog," the grocer said. "It's very powerful detergent and if you wash your dog in this, he'll get sick. In fact, it could even kill him." But the boy was not to be stopped and carried the detergent to the counter and paid for it. The grocer continued to try to convince the boy, but it was no use. The young boy's mind was made up.
About a week later, the boy was back in the store to buy some candy. The grocer approached the boy and asked him how his dog was doing. "Oh, he died," the boy said sadly. "I'm so sorry, son. I tried to warn you that the detergent could kill your dog," the grocer said.
"Well," the boy replied. "It wasn't the detergent that killed him." The grocer was a bit relieved. "Oh? What was it then?" he asked. "Mom said it was probably the spin cycle."