Boxer was sent to the glue factory. (They killed him.)
Betray them at the scene of the battle but is persuaded otherwise by squealer
The van that arrived to pick up Boxer was label for the slaughter house. The animals were distressed until Squealer informed them Boxer had actually be sent to a hospital.
Boxer was the one who disagree with the explanation that Squealer said about Snowball.
The Knacker. He is made into glue. Squealer says he is going to the hospital, but the truck says the Glue Factory. Squealer lies about that the hospital, this was one of the many examples of Propaganda.
when squealer says that snowball was Jone's agent, boxer tries to think, but was vaguely troubled. he set his ears back, shook his forelock several times, and tried hard to marshal his thoughts. but in the end he couldn't think of anything to say. four pigs in the back stood up and was going to oppose the statement but suddenly the dogs let out menacing growls and the pigs fell silent and sat down again.
Boxer fell and was injured badly. Squealer said he was arranging to take Boxer to Willingdon Hospital but when the van came, it read "Alfred Simmonds, Horse Slaughter and Glue Boiler, Willingdon. Dealer in hides and bone-metal. Kennals supplied". The pigs were taking Boxer to the knackers to be killed.
Squealer's job was to change the commandments
Squealer is the form of propaganda.
http://www.boxerforums.com/losing-patches-of-fur-t19467.html
Squealer is propaganda, but specifically, Pravda
In Chapter 8 of Animal Farm the animals, except Boxer, don't know why Squealer fell off the ladder because they don't understand that he has been changing the Seven Commandments to suit the purposes of Napoleon the entire time. The also don't know that he is drunk, which was previously a commandment punishable by death.