Update (2.4.11): This version of the paper has been accepted for publication in Philosophical Investigations. (Hooray!)
Not that anyone is interested, but I have completely rewritten my paper, "Comparing Lives: Rush Rhees on Humans and Animals." I think I copied and pasted about two paragraphs of the previous draft. This "revision" is more focused on interpreting and motivating Rhees' ideas (and doing a better job of retrieving them from the dustbin...), and I restrict the argument against capacity-based conceptions of moral considerability to one focused section.
One thing that might interest regulars which is not at all in the previous paper: I've added an Appendix in which I discuss Rhees' diary remarks (and a couple letters) about the death of his dog Danny. This happened several years after the remarks on which I focus in the main paper, but his reaction to Danny's death, and his own sense of responsibility, are so strong and striking that I felt like I needed to say something, and draw some connections with the earlier work.
The Appendix is entitled "The Death of a Dog & Eternal Life." It starts on p. 25.