Have the vet do a blood test. Could be a number of things. My dog is down now with ehrlichia and i've also had some in the past with swine brucelosis... all had the same symptoms.
HEY MIKE IS THE BRUCELOSIS CURABLE? IM TAKING HIM TO THE VET TOMORROW BUT WAS WONDERING SOME OF THE SYMPTOMS. I JUST LOST A DOG A COUPLE DAYS AGO AND HE WAS DOING THE SAME THING.IT HAPPENED IN ABOUT 3 DAYS. THANKS,
CHRIS