I have a 10 month cross breed that I had trouble finding a harness that fitted correctly or that she couldn’t pull backwards out of. I messaged to ask their recommendation on size. A had a quick response and suggestion for the size of harness to order. I’m really happy with the fit. I felt reassured that if it didn’t fit I could get in contact for them to send the correct size and the the fact you can send a photo of your pet in wearing the harnesses to check the fit. I love that you don’t have to put it over the head. My dog seems comfortable, it’s light weight and she can’t seem to pull out of it. Thank you Perfect fit, great customer service and product!