The Mega-Sena is the largest lottery in Brazil, organised by the Caixa Econmica Federal bank since March 1996.

(Brazil, Madeira, colloquial) dog (of any age) (Brazil, derogatory) a promiscuous man. (Brazil, by extension) an unfaithful man.

Yes, "cachorro" is used in Portugal, but it means a puppy, a young dog. It is used especially of baby or very young dogs, in which case de diminutive cachorrinho  is the word usually used. For adult dogs, the word used is "co".