Two Shibas with seizures

Does anyone else have two unrelated Shibas with
"idiopathic epilepsy"? My older one started at 4, younger one started at 2. I just took the older one to the neurologist and asked about them both having them and was told it's probably just bad luck and not something I'm doing or an environmental factor but I really find that hard to believe. Any good faith feedback is appreciated!