Who said "I should of shot that dog myself"?

This quote is attributed to Candy.

I should of shot that dog myself - Candy

"I should of shot that dog myself"

Candy

Character in Of Mice and Men

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"She got the eye"

"I ain't much use to myself nor nobody else"

"Everybody wants a little piece of lan'"

"I ain't got no people. I ain't got nobody in the world that gives a damn about me"