Susan,
It's weird to me that I had to take our 9 week old Chihuahua (taco bell dog) to the animal hospital last week. She was lifeless and the vet saw neurological damage. Hydro was brought up but lucky for me my Chewy rebounded after getting anti biotics, so they assumed it was a toxin that caused her problems. We are still keeping a good eye on her, but so far, so good.