Bruce was still a little too shell shocked about meeting a talking giant wolf to share Tony's casual excitement, so he didn't bother to tell Tony off for being insensitive and just meandered out of the front door with a blank expression.

The first thing that would greet Steve and Bucky would be Fenris on the front lawn, and Bucky softly swore under his breath. "That-- that's the thing that bit you? Jesus, Steve, that's not a dog."

And even the physical aside, Steve would be able to feel that. From one predator to another, one wolf to another, he would feel kin. He would know he should be subservient to the alpha, which was clearly Fenris in this situation, a kin that doesn't exist in the human realm.

Fenris stood and shook his coat, bright burnished golden eyes fixed on where his new bastard pup approached.