We have three dogs, ages 16, 12, and 7. First the oldest, then the middle, and now the youngest one are all exhibiting stroke or seizure-like symptoms: head tilted to side, one eye not focused, not blinking as much, trouble walking. The older two are female and are being treated with Prednizone, which is definitely helping. The youngest one began exhibiting today, will see the vet tomorrow. I looked at RoundUp as the cause, but it doesn't seem to fit the bill. Any thoughts?