Sounds like your little guy is still young. Don't worry about it too much, as my Java was had that problem when he was that age. He's 14 months now and there's definitely light at the end of the tunnel. Some dogs just can't/won't hold it that long at first. I kept with his potty schedules and made sure he associated pottying outside as a positive behavior. My washing machine was running non-stop to clean all the urine drenched towels. I also became a stock holder of Nature's Miracle.
