Why would it matter if it didn't go up to the largest size if the one you have is too big?

Does your halti not have the extra clasp that attaches to the collar? Your pic does not show it.....on the ring that's hanging down, on my halti there is another strap that goes to from that ring with a leash clasp on the end that you put on the collar. That way, if the halti comes off, the leash is still attached to the dog, and the dog shouldn't be able to get away.

p.s. I *think* Nebo's halti is a size 2...not positive...Lady's is the same size as Nebo's....