What is a key step when lifting a small injured dog from a cage?

Using a muzzle before handling a small injured dog is a key step because even the most gentle dogs can react unpredictably when they are in pain or stressed. Pain can trigger a fight-or-flight response, potentially leading to biting as a form of self-defense. This measure ensures the safety of both the dog and the handler, enabling you to proceed with care.

While the other options involve considerations for lifting a dog, they do not prioritize safety in the same way that using a muzzle does. For instance, placing the dog directly on the floor may not be the safest option, especially if it could exacerbate any injuries. Relying on assistance from two people can be beneficial in some cases, but it's not always necessary for a small dog and doesn't address the immediate risks during handling. Holding the dog by its collar is not advisable, as it may cause further stress or injury, especially if the dog is already hurt.