my pup got stung by a bee last summer his head swelled to almost twice the size he was lay on the patio blowing bubbles from his nose. i rushed him to the vets and they gave him a injection straight into the vein and i had to wait there almost a hour to see if the swelling stopped. thank god it did, thought i was going to lose him. it still took 5 hours for the swelling to go down but he has been fine since. hes been stung again since and only had a very small swell around the actual sting site.