CBD Research Epilepsy (IMAGE) Colorado State University Caption Based on her research, Dr. McGrath found that 89 percent of dogs who received CBD in the clinical trial had a reduction in the frequency of seizures. Nine dogs were treated with CBD, while seven in a control group were treated with a placebo. Credit John Eisele/CSU Photography Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.