Luckily, around night 6 a certain apathy kicks in.

• Number of animals I've killed last night: 4
  (Perhaps worth clarifying, that was what I set out to do. If they'd all died on me while I was trying to keep them alive, my mood would be much worse.)
• Number of animals on whose life I potentially improved in a meaningful way: 1
  (Oh, I treated a couple more, but if you're a 14 year old Lurcher, nothing I do will make much of a difference to you anyway.)
Sometimes work is not exactly uplifting.
Oh well.
• Number of nights I still have to work: 3
• Number of animals I might have adopted: 1

Have two pictures of Tiny, looking at him without being cheered up is not easy: