Written and originally recorded (as “Brandy”) by Scott English (US #91/UK #12 1971).
Other hit versions by Bunny Walters (NZ #4 1972), Barry Manilow (US #1/MOR #1/UK #11/CAN #1 1974).
From the wiki: “Under the title ‘Brandy’, the selection’s original title, the song charted in 1971 for Scott English, one of its co-writers (along with Richard Kerr, who would go on to later write ‘Somewhere in the Night‘ and ‘I’ll Never Love This Way Again‘), whose version of it reached #12 in the UK Singles Charts. It was also released in the United States, but barely made the Billboard Hot 100.
“The suggestion that the song is about a favorite dog is apparently an urban legend. English has said that a reporter called him early one morning asking who ‘Brandy’ was, and an irritated English made up the ‘dog’ story to get the reporter off his back.