Yiddish: If a horse had something to say, it would talk.

SOURCE: Stutchkoff, Der Oytser fun der Yidisher Shprakh.

װען דאָס פֿערד װאָלט געהאַט װאָס צו זאָגן, װאָלט עס גערעדט.

Ven dos ferd volt gehat vos tsu zogn, volt es geredt.

If a horse had something to say, it would talk.