I used the Sporn no pull harness with my previous dog and loved it but Simone pulled so hard it abraded the skin in her axilla requiring vet visit and antibiotic. It is an older version bought years ago before they started using sherpa covering. I recently bought the Weiss walkie, love it!!! Simone cannot pull with it on plus I find it easier to get on her when she's excited. She walks like a well mannered dog now.