“He’s a very calm cat, which was… you know, important. He helps me meditate. Tony tried to give me a snake for some reason, but Dr Tabby didn’t like it, so I thought I would donate it to Fury. He seemed like a ‘snake’ guy, but apparently, he has a thing about ‘mothereffing snakes.’ So Nat adopted Dr Slithers.”
Bruce isn’t all that creative with names, but he’s adamant that any animal that helps with therapy is automatically a doctor, hence the title. Dr Tabby has totally owned him.