who bought buck-at what cost? for what purpose?

Sled dogs were in demand because of the gold rush. Buck was stolen by Manuel the gardener and sold for $100. He was sold to man called "the man with the red sweater".Later Buck is sold for $300 to Francois and Perrault who deliver mail for the Canadian Government.

The man in red sweater bought him from the man who stole him named Manuel and the man who bought him from the stealer is going to use him to help deliever mail💯😍