REisling may have gotten mixed up and grown in a winter coat!  This would
account for the color change, the extra weight (fat to help keep warm in
the winter) and the lethargy- too much fat and a thick coat making for a hot
fuzzy!  Sometimes our domestic beaties do this as their light- our
electricity, doesn't rise and set with the sun.  If they spend a lot of time
in the dark, or darkishness, that could be a cause- or just that they got
'confused'.  There isn't much you can do, except help keep them cool, and
if she starts to shed, help by patting or brushing her a lot.   :)
 
[Posted in FML issue 0867]