Ratty is basically Black, with White Whiskers , 4 white paws and White Bib joined to a White patch between the hind legs by a Thin Streak of White.
He was wearing a distinctive red reflective collar with a disc giving a phone number
Ratty is supposed to be having regular medication for an abscess recently removed from his cheek, he'd only had his antibiotics for a couple of days and was being kept in the house while he was having them. Unfortunately he got out, and hasn't been seen since.