John Henry, thoroughbred racing's all-time money winner, galloped yesterday and might be able to compete in the $2 million Breeders' Cup. The 9-year-old horse had apparently injured his left foreleg during a workout Sunday and was questionable for the Nov. 10 race.

"He looked real good," said trainer Ron McAnally after the workout. "I'd say it was 60-40 in favor that he will run in the Breeders' Cup."

However, he said if John Henry misses a final workout planned this weekend, "he will miss the race" . . .

The Post's harness racing handicapper, Jack Nowakowski, picked winners of nine of 11 races last night at Rosecroft . . .

Dew Line, a graded stakes winner owned by Jerry Hoffberger, is the 118-pound highweight in the 12-horse field entered for today's 16th running of the Walter Haight Handicap at Laurel. The 1 1/8-mile race is named for the late Washington Post writer . . .

Former riding champion Jesse Davidson, one of five jockeys convicted of fixing a triple race in 1975, will appeal last April's decision of the Maryland Racing Commission refusing to reinstate him as a jockey.

Davidson, 44, is licensed as an exercise rider and is eligible for a license as a trainer. But the commission, in a 4-to-1 decision, refused to allow him to ride.