Apart from being a Whispering One, and having heat sensors/eyes on tongue, does Iralbe have any other mutations?
The heat sensor eye holes and eyes on the tongue aren’t actually related.
But aside of that, there’s lots of minor things almost every other hound also has, some invisible (like immune system variations not found in dogs, stuff like that) and some others just barely noticeable. Iralbe is bigger than a dog, has solid, pale silver coloring (that comes from a mutation back in their family line), and like all hounds shown in the comic they has nails covered by tooth enamel.
(You can go back all the way through the comic, but all the hounds have white claws while dogs have black ones. Aside from Nightclaw, who had standard black dog claws instead.)