I have an otherwise healthy 4 y/old shihtzu that until 2 days ago was very energentic and happy. All of a sudden, she is lethargic and won't eat... I have no idea what happened to her... Help... Thanks... Joy

Maybe s/he ate something that made her/him sick. I'd recommend you to check with a vet.

I it could be a tick born sickness... get your pup to the vet and have them check for everything. If it is a tick issue it needs to be treated fast or it could be fatel. Not to scare you, but more dogs are getting sick from tick born illneses nowadays than I can ever remember.

It could be 100 different things, from minor to very serious. Please take your dog to a vet.