Should I get a new collar for Sandstorm? Slipped out of martingale

[KarenCurtis]

How to measure for a new martingale?

Thanks everyone. Problem- I foegot where I ordered it, and how to measure now?

 

[KarenCurtis]

Sargent Storm! You need a new uniform! Your old one stretched! Uniforms must be tight! Get tight!
Colonel Underpants

Colonel Underpants!! I need a new uniform! I am a sargent!
Sandstorm