as a

Freddy says that he’s sick as a dog, so he can’t meet up with me at our favorite bar.
Sick dog? Is one of your dogs sick? I ask.
I’m a vet. I take care of Freddy’s dogs. He’d have said something if one was sick.
“No, as sick as a dog!”
Oh, I must have misheard him.
I guess I’m getting to be as deaf as a post.
Freddy works for The Post. As an ombudsman. He has to listen all day to readers.
He swore and hung up. I guess he heard me the wrong way or something.