The 19-year-old Henderson injured his shoulder while helping his father out on his farm.
Queen of the South's first-choice goalkeeper Alan Martin is out with a long-term thigh injury, leaving Jack Leighfield as their only sure-fire option to face Dunfermline on Saturday, since Henderson faces a race against time to be ready for the bench.
The Doonhamers' assistant manager Dougie Anderson told The Scotsman: "Sam has missed training this week. It could have been worse as the cow ran at him for a second time but he managed to get out of the way.
"He has a sore shoulder so he is getting closely monitored and a lot of treatment as we do not want to go into the game without a goalkeeper on the bench."
It is not yet known exactly how long Henderson will be out for. Moo!
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