Last year (2018) we found a flea on Penny, (our at the time 5 year old) Collie/Golden Retriever mix. We bought this from the pet store and within hours we noticed her behaving oddly. She laid down for a nap and awoke in violent tremors. We called the vet and they insisted it was nothing to worry about, could have been a night terror. The next day it was the same, another seizure. This happened for days. I researched what could cause seizures out of the blue and 1 article I read stated to check products used that normally we wouldnt. The shampoo. I tossed it. I took her to the vet, and she seemed to slowly get back to normal. It’s been a year, and no seizures since.