A particularized implicature is a conversational implicature that is derivable only in a specific context.
A: What on earth has happened to the roast beef?
B: The dog is looking very happy.
Levinson, Stephen C. 1983.Pragmatics. Cambridge, England: Cambridge University.
Grice, H. P. 1975. "Logic and conversation." In Cole, P. and Morgan 1975 41–58.