An at least partially open sided outdoor animal shelter structure (20) to condition animals, when positioned within the structure (20). to a desired physiological state by controlling the environment in the structure, the structure including a floor (2) to support animals, side supports (23), a water impervious canopy (22) supported by the side supports (23), the canopy (22) being supported above at least part of the floor (2), the canopy (22) allowing at least some ambient light to pass therethrough and into the structure (20), and wherein there are ways in which to control the temperature and/or airflow under the canopy (22) in a passive manner such as by a movable shade cloth (30), that in one condition is located intermediate of the canopy (22) and the animals to offer shade to the animals when in the structure (20) and in at least one other condition is retracted from being positioned to offer shade to such animals.
