Fog is indeed a sleek, long bodied, long tailed cat with a dense plush coat. When the vet shaved his throat to draw blood to check for pancreatitis (tried his forearm but couldn't get a sample) it came off as one lush intact poof of fur which she and I both admired.
As a kitten he was a silver and pewter butterfly tabby but with maturity he darkened to the luscious, even, grey color you see here.
Send him good vibes that he recovers from the wobbly back legs.