My dog LOVES to sleep on my iBook G3's power adapter, but not my Powerbook or MBP's. She is a Lhasa Apso, Candy. Whenever I am on the couch with my iBook and its power adapter plugged in, she will lay her head on the adapter! But, here's the thing: She only does it whenever I play songs on iTunes, so I experimented. I used my iBook regularly w/out iTunes going, but the second I played a song, she came over and layed her head on the adapter, but when I pressed pause she got up and left. I pushed play and she turned around and came right back!