The dog that kills wolves, is killed by wolves.
More Spanish Proverbs:
A tree often transplanted neither grows nor thrives.Spanish
Whither shall the ox go, where he will not have to plough?
Spanish
He who measures oil greases his hands.
Spanish
The cask full, the mother-in-law drunk.
Spanish
He falls into the pit who leads another into it.
Spanish
When there are two friends to one purse, one sings, the other weeps.
Spanish