Large breed dogs have a presence about them just because they are big.
Large breed dogs capture your attention with their size.
ーLarge breed dogs have a presence about them just because they are big.
「大型犬はただ大きいというので、存在感がある。」
large breed dogs で「大型犬」
have a presence about ... で「存在感がある」
just because ... 「ただ…というので」
ーLarge breed dogs capture your attention with their size.
「大型犬は大きいということで人の注意を引く。」
capture your attention with their size を使っても表現できるかと思います。
ご参考まで！
カナダ 
