Dog crates used appropriately for short-term management and trained positively can support welfare; overuse as long-term housing causes significant harm.
Dog crates are a context-dependent welfare tool. When trained positively and used for short periods, a crate provides a safe space that dogs may actively seek and a management tool for situations where unsupervised access is unsafe. When used to confine dogs for the majority of their waking hours due to owner absence or as a lazy substitute for training, crates cause welfare harm through physical restriction, social isolation, and inability to express normal behaviour. The critical factor is duration and the dog's trained emotional response to the crate: a dog that enters willingly and is calm inside experiences a different welfare outcome from one that is forced into confinement it cannot escape.