Quarterly Bordure? Silver Fox Normal/Proper?

Hi, I’m currently designing the coat of arms for a character and I’m unable to find any examples of this. I’ve seen plenty of examples of the Bordure being cut into four quarters, but can I put a Bordure around a shield that’s already a Quarterly?

Second question, are silver foxes allowed as “normal” or “proper” like red foxes? I’ve seen them on some Russian heraldry, but I’m curious if they’re permissible under western conventions.