Not exactly true. Shih Tzu is just as English as et cetera is English, as ad hoc is English, as per se is English, as carte blanche is English, as vice versa is English, as de facto is English, as per se is English, as mea culpa is English, as verbatim is English, as per capita is English, as cul de sac is English, as al dente is English, as alfresco is English, as coup d'etat is English, as en masse is English.
And of course, I have to end this small list with ET CETERA because I could list sooo many more.