The phrase 'tranquilo el perro' is not a common or established slang term in Spanish. However, it can be literally translated as 'the dog is calm'. It might be used in a colloquial context to suggest someone should calm down or relax, similar to the English phrase 'easy, tiger'.
Examples
- Spanish: Tranquilo el perro, no hay necesidad de enojarse por algo tan pequeño.
- English: Easy, tiger, there's no need to get angry over something so small.