Bee and wasp stings usually cause just minor swelling and itching. If you can see the stinger, use a credit card to scrape it out, or pull it out with tweezers. An antihistamine like Benadryl will relieve some of the symptoms, but call your vet to ask how much to give. If you notice any swelling on the face or neck, or hives all over the body, get the animal to the vet right away. This could be a severe anaphylactic reaction -- a definite emergency.