This is our 4th Pet Stroller in around 2 yrs, 3 from other company's. The 3 previous all continued to have wheel problems breaking or structure problems. We have 2 Small Maltese Dogs, weighing less than 15lbs combined, and these other strollers kept breaking down even though they were rated for up to 50lbs?? Anyhow this time we decided to go with this brand for a few good reasons. 1st is the wheels which are 10\" & 8\" and super constructed, much less the frame has shock absorbers. Our old strollers had 5\" wheels flimsily constructed which always broke. Mfg was a wholesaler who stated they could not supply parts?? Anyhow, trust me, this New stroller is very well built. It also can be used as a car seat, just unhook and strap in car. The larger wheels make this a dream to roll. The price was much lower than we paid for the other strollers also and this one is built correctly. 4 wheel design also makes it safer to roll. You can not go wrong with this one. Highly recommend!! TKX