my 9 yr old german sheperd is very lathargic, wont eat anything incliding ham (which is his favorate) this only seems to last for a few hr at a time and is the second time it has happened in the last week, he is very shaky on feet and cant be bothered to even move, almost like he is spaced out he is also drinking excessively over the last week or so he is normally puppy like full of energy and wanting to play. please help
trina