The article suggested that it might be that Oscar likes the electric blankets the sickest patients sometimes get. Perhaps it’s even simpler: Dying people move less than everyone else, but they’re pretty much as warm.
I didn’t read the article (I will after I post) but I have a theory (but it’s not bunnies). There is a school of thought that says animals can read auras. A soul escaping from its corporeal bounds could give off a very strong, very appealing (to Oscar, anyway) aura (I remember MAD magazine’s send up of Love Story in which Ali McGraw got prettier the sicker she got - and that’s how Ryan O’Neal knew she was going to die)
off to read the article now
eta: done reading article - I stand by my theory