Looks good, did you by chance get the idea from my post/thread in the photo forum?
Possibly, I have just wanted to make one for a while and the dogs old collar was starting to frey. So I pulled the d-ring and tag loop from his old one and used a set of larger buckles that I keep as spares for my camping pack and started making it. I didn't reuse the old buckle because it wasn't near as strong as the spares I have and he is now 85lbs and I wanted to make sure it would hold up.
I had wrapped it once with the standard 2 lines in the middle and then took it all apart and added two more strands in the middle to make it thicker. I didn't want a king cobra were you wrap the first cobra with a second around it due to the possible weight.