Bucky is familiar enough with feral dogs and their dependencies, but the commentary throws him off completely. None of it is particularly insulting or judgemental but it's certainly not how Bucky would have described himself. Also, John Doe is a really shady name, and the kid's attitude isn't helping to alleviate the concern sitting in Bucky's furrowed eyebrows much.

"It's lasagna. How do you know I'm carrying," Bucky asks flatly, stepping inside to put his food delivery down while discreetly glancing around in case there's any other surprises waiting for him inside. Apart from the dog tags, of which only the chain is visible right now with the actual tags sitting under his jacket, Bucky didn't think he appeared particularly like the type to be shooting anything, let alone children. Maybe it's the staring problem that makes him seem threatening.