I have a 65+ pound GSP with a deep chest. It is difficult finding a vest that fits him decent around the chest. This vest fit him around the chest but just barely. The material on the chest seems very durable and protected him well. The rest of the vest also seems durable as well. The buckles on the other hand is a different story. The straps that hold the female end of the buckle have torn off after hunting the dog in the field less than 10 times. We have hunted some thicker country including cattails. I had high hopes for this vest as I felt that the material would protect the dog and did. However, I am going to have to figure out a way to see the buckles back on before it made it through one hunting season.