I found this really nice website on sleeping dogs lol.
I think I remember reading somewhere that dogs need like, 18 hours of sleep or something. I know my little butt-butt sleeps whenever he can be near me. I find it so adorable, but he gets startled out of his sleep easily and he get's snippy. Or he'll go all guard dog when he's sleeping and hears another dog on tv or something!
Why do dogs sleep so much?