Final answer:
Option B contains an item not necessary for a pet First-Aid Kit: a toy. Essentials like gauze, tweezers, and adhesive tape for wound care are crucial, unlike toys that serve no immediate medical purpose.
Step-by-step explanation:
When assembling a pet First-Aid Kit, each item should be carefully considered for its practicality and necessity in an emergency. Looking at the lists provided, option B includes an item that is not essential for immediate medical care: a toy. While a toy could potentially be used to comfort or distract the pet, it is not a medical item. Items such as gauze pads, tweezers, and adhesive tape are much more critical to address wounds or injuries.
On the other hand, List D contains essential items that could be used to address injuries or stabilize the pet until professional help is reached. An instant cold pack can be used to reduce swelling or pain, cotton balls can be used for cleaning around wounds or applying medications, a leash can be crucial for controlling the pet's movement, and a blanket can be used to keep the pet warm, prevent shock, or safely transport the pet.
According to the review question's reference information, a medical item that contacts intact skin but does not penetrate sterile tissues or mucous membranes is referred to as a 'non-critical' item. These items do not require sterilization, which is reserved for items that will penetrate sterile tissues; these are known as 'critical' medical items.