Thinking that's really cool!...My doggie & cat have a race to see who can get to the door when someone is knocking....and my doggie licks my leg whenever she wants to go out. Do believe my doggie knows I'm deaf, but not so sure about the Cat...
I had a cat that knew that I was deaf. He would nudged on my arm or shoulder very gently letting me know that he wanted attention. He is long gone and passed away.
I have a dog and I think he knows I am deaf. He barked only for himself, not for me.