I always like to judge heath in part by fur condition... and via this photo, Duke's fur is looking fabulous, with good sheen.
Our adopted one, Big Man Mr. Steve, is also getting healthy. He's over his "kitty kennel cough" and putting on weight too (now at about 3 lbs.). His fur is softer... and like Duke he's getting more rambunctious (with health... or with familiarity?). For "Mr. Big," this means climbing up to sit on our heads, climbing up to the counters, or ambushing Cha-Cha (who has grown to just ignore him). He is really good with baby E. Although all their interactions are highly supervised (for his safety as well as hers), she loves him.