Boxer injured his hoof.
To the glue factory.
To a human hospital.
Actually belonged to the hospital.
They hadn't gotten around to removing the sign.
Boxer's "last" words were "Forward Comrades! Forward in the name of the Rebellion!" and "Long live Animal Farm! Long live Comrade Napoleon! Napoleon is always right!"
The pigs buy whiskey with the money they receive from Boxer's sale.
Hope it helps!