I ask because twice now I've seen Thumper what can only be describe as jerk, for a minute or so, then stop, just her top half and only by her chest area. It appears rhythmic, akin to human hiccups. Both times she's been lying down, relaxing and this jerking doesn't seem to bother her i.e. she doesn't seem to be stressed out; ears normal, eyes normal, breathing normal. Or could it be just a muscle spasm? Just wondered if anyone else had experienced the same.