If your dog is stung by a bee, hornet, or wasp remove the stinger first. Locate the stinger, using a magnifying glass if necessary, and carefully pull it out with tweezers or your fingers. After removing the stinger, bathe the area with a weak solution of baking soda mixed with water (one part baking soda to several parts water). Then apply a cold compress or ice pack for several minutes to reduce the pain and swelling. Repeat this periodically for several minutes at a time.
Some dogs will need immediate veterinary attention because they are allergic to bites and stings. If a dog is bitten or stung on the face, severe swelling can interfere with breathing. If the affected area swells up quickly or if your dog is having trouble breathing or seems disoriented, take him to a veterinarian immediately. In emergency situations where you cannot reach a veterinarian, give your dog Benadryl. Ask your veterinarian before an emergency occurs about the proper dosage for your dog. This should slow the allergic reaction. If you suspect a venomous spider bit your dog, he will need immediate veterinary attention.