my 2 year old teacup poodle isn't her normal self, she's usually ver active ,and barks when anyone come in the house , but all of a sudden 'she seem to be drouzy a lot ,and can't keep her eyes open , she won't even respond when i call her.
I would suggest that you take her to your vet and get bllodwork, full chem done. That would give you a place to start and give you some answers. I am sorry about your pup, not knowing I think is the worst part. Please post more if/when you get some answers from your vet.