The dog had epileptic seizures and was always taking pink powder medicine.
"その犬はてんかん発作持ちでいつもピンクの粉薬を飲んでた"
- The dog had epileptic seizures and was always taking pink powder medicine.
- That dog had epilepsy and was always taking powdered medicine that was pink.
- That dog had epilepsy and was constantly taking pink-colored powdered medicine.
That dog had epilepsy so he used to take a pink powdered medicine.
That dog used to have epileptic seizures so he had to take some pink medicine.
epilepsy は「てんかん」という意味の名詞で、これを使って言うなら、次のように言えます。
ーThat dog had epilepsy so he used to take a pink powdered medicine.
「あの犬はてんかん持ちでピンクの粉薬を飲んでいた」
「てんかん発作」と言いたい場合は、epileptic seizures と言うと良いでしょう。
ーThat dog used to have epileptic seizures so he had to take some pink medicine.
「あの犬はよくてんかん発作を起こしていたので、ピンクの薬を飲まなければいけなかった」
ご参考まで！
アメリカ合衆国 
カナダ 
