“Don't look for the cat's 5th leg.”

It means not to search for unnecessary complications or details where none exist.

Translation in spanish

“No le busques la 5ta pata al gato.”

Significa que no debes buscar complicaciones o detalles innecesarios donde no existen.

Phonetic:
/No leh boos-kehs lahs beyn-teh pah-tahs ahl gah-toh/