For long-bodied dogs, both male and female 3-WAY Care Harness Quilt Red, size 3 Size 4 was too big, so I purchased size 3 from the official website, but it didn't fit my dog, whose spine is curved, so I couldn't use it. It seems like a good product, so it's a shame I couldn't use it. Only tried it on. Please understand that this item has been stored by a private individual before purchasing. *No smokers, has dogs and cats*