1.Because he doesn't want to be in the crate so he whines and whimpers which is kind of like a child crying if they don't get what they want. Ignore him if he is whimpering because he just wants attention and to get out of the crate. That is one of the ways of teaching dominance to a dog
Give him attention when he's not whimpering and whining that way he should stop whimpering.
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