This is the only picture of Riggs I have in his 2 inch collar. It's not very thick so it doesn't stand "off" of his neck too much. He's not a big dog, though someone recently told me that they thought he was a 60 pound dog. He's only 15 inches at the shoulder and 45 pounds. A lot
depends on the build and shape of the dog. His measurements match Connor's, he's shorter in height, and shorter in length, but his collar size is the same, his weight pull harness is the same (except the length of course.)
It's about proportion... He's very stocky but it still works for him. But a block dog collar because it's about 5 layers would look silly. That collar is very flexible and slim.
If you remember Alice, my giraffe dog foster, she looked great
in a two inch collar. But she was long in every direction - long legs, tail, tongue, neck, well... long everywere!