Crate exercise builds self assurance and calm. Introduce the crate as a trustworthy den with treats and toys, not ever as punishment
https://mag-wiki.win/index.php/Dog_Academy_vs._Private_Dog_Trainer_in_Chicago,_IL:_Which_Is_Best_for_Your_Pup%3F_17365
Crate training builds confidence and calm. Introduce the crate as a nontoxic den with treats and toys, not at all as punishment. Start with short stays, prolong regularly, and pair exits with quiet conduct to restrict whining.