Dog got knifed badly when he attacked Machete Man (MM) for the 2nd time AFTER the strongbox was finally opened by Richard Boone. Dog's squeals/ cries were later heard when he was finally killed by MM during his third ferocious attack on the man in order to save "the boy."
As for (not) knowing of Indian Sam's death, Richard Boone - just before being killed - wondered out loud to Big Jake if "the boy was going to get it" by bullet or machete just like the Indian.
Since we're never told of the death of the son Jeff, it's assumed that he (painfully) lived.
As for his guns, they did their job; keeping them would only remind him of the loss of his friends Indian Sam and Dog. :-(
Do John Wayne westerns/ war movies usually EVER end on a sappy note e.g., all's well at home - when obviously there's 10+ deaths to mourn and a long, sore, painful ride still left to return back home?
Also, the movie primarily concerned the retrieval of "the boy" by Big Jake et. al. no matter the cost - WITHOUT repeated scenes of his wife worrying about her husband, sons, & grandson.
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