I've recently adopted a deaf kitten (two days ago). She doesn't respond to any sounds, but she does respond to my senior non-deaf cat hissing and growling (I'm slowly introducing them).
Is it possible that our deaf kitten can sense the growl/hissing? They don't even need to be in eye-shot of each other. The senior cat hears the kitten's bell and growls, and the kitten can pick up the growls/hissing and responds with her own growls. Could someone maybe explain this?