Benadryl is commonly used to treat a variety of symptoms in cats and dogs, including itching, allergies, and mild cases of anxiety or motion sickness. But, Benadryl can also save your pet's life in certain emergencies. Pet parents should consider Benadryl a staple in their medicine cabinets and first aid kits. In the event of a snake bite, severe allergic reaction, life-threatening wasp stings, or similar anaphylactic reactions, Benadryl given immediately can mean the difference between life and death. 4.44$ on Amazon.