My mom's Snoopy is on Phenobarb for his seizures, and I have never noticed him being aggressive to dogs or humans. I don't know what his dose his, but he gets it twice a day.

Cincy is on Prednisone for her alleriges, but she gets a very low dose, 2.5 mg -5 mg, and not every day. She has no aggressive traits, other than sounding mean when she plays!