I've had my trusty Dogger for about 10 years. It was a godsend for my two Shih Tzus as they aged. One of the inner tubes blew after several years and I had to replace it with a tube from a local bike shop. Of course they were out of the curved valve tubes but I was desperate. Fast forward a few years to using it with my new Shih Tzu puppy and I couldn't stand the inconvenience of the straight valve on that one tire. So I ordered a new replacement tube from Dog Quality and it's great. Like everything else on this site!