Dallas Cowboys -- Placed RB Robert Lavette on injured reserve; signed WR-kick returner Kenny Duckett; activated WR Gordon Banks; released WR Leon Gonzalez.

Seattle Seahawks -- Signed WR Ray Butler; placed WR Byron Franklin on injured reserve.

New York Jets -- Signed free-agent CB Carl Howard; waived T Billy Shields.

Toronto Argonauts (CFL) -- Signed Coach Bob O'Billovich to a two-year contract. HOCKEY

Pittsburgh Penguins -- Will give GM Eddie Johnston, who has worked without a contract for 1 1/2 years, a written agreement.

Montreal Canadiens -- Hired Hall of Fame defenseman Doug Harvey as part-time scout.

New York Islanders -- Sent D Ken Leiter and C Roger Kortko to AHL Springfield.

Buffalo Sabres -- Recalled C-LW Don Lever from AHL Rochester. BASKETBALL

Boston Celtics -- Signed F David Thirdkill.

Philadelphia 76ers -- Signed G Butch Carter; placed G Voise Winters on waivers. BASEBALL

California Angels -- Signed P Don Sutton for 1986 with option for '87.

New York Yankees -- Say they have broken off talks with Montreal on trade for OF Andre Dawson. P Phil Niekro says club has told him it wants him back for 1986 season.

St. Louis Cardinals -- Will join at least four other major league clubs next year by including drug tests as part of new player contracts, General Manager Dal Maxvill said. COLLEGES

Vanderbilt -- Watson Brown, coach at Rice the past two seasons, will return to his alma mater as head football coach. LOCALLY

Joe Holman -- The long-time Washington sports publicist was listed in good condition after undergoing surgery at Sibley Hospital to repair a fractured left hip. BOXING

Fort Belvoir -- Keely Thompson of Arlington lost 10-round unanimous decision to Virginia junior lightweight champion Jose Gonzalez of Portsmouth Wednesday night. Tony Ojo of Reston retained his state welterweight title with a ninth-round TKO of Robert Jackson, Portsmouth. Junior lightweight Antonio DeBarros of the Cape Verde Islands (and Oxon Hill) knocked out Aaron Fulton, Norfolk, in 2:04, first round.