Trixie I call "
Pillow Butt"

because sometimes when I'm on the couch she'll sit half on the back of the couch and half on my shoulder so I lean my head on her like she's a pillow. (She's pretty comfy too!)
Lexi really doesn't have a nickname. (Unless you count "
Sorry" which is what hubby lovingly calls her all the time.)
Chipsie gets called
Chits or
Chi-Chits alot...not really sure why I started calling her that. And hubby calles her "
Foxy" because he says she 'slinks' around and is sneaky (which is true!)
Flash (our Basset) we call "
Plash" sometimes because that was how my daughter pronounced her name when she was younger and we'd just gotten her.