Do you know what to do if your dog is stung by a bee or wasp?    

Bee and wasp stings can be painful and frightening for a dog. A single bee sting will produce pain, swelling, redness, inflammation. If your dog is stung, follow these steps:   

1.    Carefully remove the stinger with tweezers.   

2.    Apply a paste of baking soda and water to the site of the sting.   

3.    Apply an ice pack to relieve swelling and pain.   

4.    Ask your vet about giving your dog a dose of oral antihistamine.   

5.    Give your dog fresh water and watch them carefully   

Allergic reactions usually occur within 20 minutes but can be delayed for hours.   

What if the Dog is Stung on the Head, Mouth, or Nose?

If the sting is on the nose, mouth, or around the head, observe your dog for several hours to make sure that any swelling does not interfere with breathing or swallowing. If the swelling increases dramatically after a few minutes after the sting, see a veterinarian immediately.   

If your dog disturbs a hive, call them to you and put distance between your dog and the swarm immediately. Then, take your dog to the closest veterinarian. Treatment for massive amounts of stings must occur quickly to prevent shock and circulatory collapse and to minimize damage to organ systems. 
  

https://www.akc.org/expert-advice/health/dog-stung-bee-wasp/