What are the two prerequisites before attempting to pick up a dog?

When preparing to pick up a dog, it is essential to ensure both the safety of the dog and the person lifting it. Using a leash is crucial as it provides control over the dog, allowing the person to manage the dog's movements and prevent it from jumping or running away. Crouching to the dog’s level is equally important, as it helps the dog feel less threatened and more secure, reducing anxiety. This approach promotes a positive interaction and builds trust with the dog.

The other combinations of items listed do not prioritize the safety and accessibility required when picking up a dog. While items like a collar and harness or food and treats might be useful in different contexts, they do not serve the primary purpose of ensuring control and comfort when lifting a dog. Similarly, having water is typically not necessary in the immediate act of lifting a dog. Crouching down creates a welcoming posture that adjusts the human's size in relation to the dog, making the action less intimidating for the animal.