"pro bono" ("for good") is short for "pro bono publico" ("for [the] public good"). In the US, it usually refers to professional work, especially lawyer's services, provided for free as a public...
Canem is a form of the word canis, which means "dog". This specific form (the accusative singular) is used when "dog" is the object of a verb or of certain prepositions, for example super meaning...