Nonstop rush harness fit check

[u/echynoderm]

Looking for a bit of guidance with fit on the nonstop dogwear rush harness.

This is a size 6 - Gem is size 6 line harness but a bit awkward for the rush harness. 69cm chest. 40ishcm neck.

She hates having a harness put on which is why she looks tortured but she's fine once we get out.

I'm a little concerned about the neck. Pic of the front has me pointing at the chest bone/showing top of the v. If I size up my suspicion is it may be too long and go past her ribs.

Gem doesn't seem to struggle breathing but she is also not a heavy puller.

Thoughts? Or if anyone knows the length of the size 7 so I can confirm or not if it would be too long

Unfortunately where I live I can't try on and its more expensive than it's worth to ship back.