1916 23 Feb. ‘You sound Hibernian.’ ‘I am as Irish as Paddy's pig, and proud of it.’
1974 I. Agnew 185 There's one who reminds me of Crawford from the Dunedin gaol—as ignorant as Paddy's pig.
1998 (Nexis) 1 Nov. 4 b I'm as Irish as Paddy's pig with Irish immigrant roots deep in Holt County.