You can't teach an old dog new tricks
ɐ ʊn ɡos ʋɛʎ no sɛ li ənsɛɲən nɔws tɾuks
In Catalan A un gos vell no se li ensenyen nous trucs.
This idiom is a direct translation and is commonly used in Catalan culture.
Example
"Ell no canviarà, a un gos vell no se li ensenyen nous trucs."
