Crate workout builds self assurance and calm. Introduce the crate as a reliable den with treats and toys, under no circumstances as punishment
https://uniform-wiki.win/index.php/From_Leash_Pulling_to_Perfect_Heel:_Success_Stories_from_Dog_Training_in_Chicago,_IL_47867
Crate classes builds self assurance and calm. Introduce the crate as a protected den with treats and toys, certainly not as punishment. Start with brief remains, increase step by step, and pair exits with quiet behavior to avert whining.