Silver has been merged with a weasel; specifically, the Japanese weasel. He has rounded ears, a bit bigger in proportion than usual for weasels, and a tail about as long as one of his legs (just slightly shorter). His fur matches his hair, being solid red, and he doesn't change color based on season.

He has Rut, and therefore is susceptible to the scent of those in Heat. While it's extremely rare, he can also go into Heat.

Instinct-wise, Silver has gained some minor aggression when dealing with "his territory"; essentially, if he feels someone is trespassing or overstaying their welcome in his room, he'll become more directly aggressive towards them, though not to a point of starting fights. He's also become very aggressive (though not hostile) in sex, tending to be dominating and forceful if necessary.

He's also become more of a carnivore and prefers meat; he's still an omnivore, but he finds it harder to really desire fruits, vegetables, and so-on.