На вълка вратът му е дебел, защото си върши работата сам.
Translation: The wolf has a thick neck, because he does his job on his own.
French
On n'est jamais si bien servi que par soi-même.
Translation: One is never as well served as he is served by himself.
Italian
Chi fa da sé, fa per tre.
Translation: He who works by himself does the work of three (people).