What must all animals be under before entering the water?

The correct concept is that all animals must be under stimulus control before entering the water. This means that the animals should respond appropriately to cues or commands from their handlers, ensuring they act in a safe and reliable manner. Stimulus control involves training animals to associate specific signals with certain behaviors, allowing handlers to manage their actions effectively in various situations, including potentially hazardous environments like water.

With stimulus control, an animal understands what is expected of it, reducing the risk of unexpected behavior that could lead to accidents or harm. This aspect of training is crucial for safety when engaging with animals near or in water, as it helps ensure that the animals behave predictably, which is particularly important when dealing with numerous distractions or potential dangers in such an environment.