He's usually hanging out with Dylan and Dolly, who are probably their best friends. He shares Dolly's love for adventure and fun, but, on the other hand, even when he's very different to Dylan, he consider him one of his best friends and is usual to see them together.
Also, it's very common to see him with Big Fee and Sid, who form his gang.
Fergus is a teenager fox with orange and white fur, black "socks" and ears, and a fluffy tail in a more desaturated tone of orange and a white tip.
One of his personal marks is a golden fang, usually in the right side (but it changes of side with the camera view).
He usualy calls Dylan by nicknames like "Dyl" or "D-dog".