Bee Stings and how to treat them..This is a great article that I have found for you, Let me know if it worked for you by leaving a comment.
Benadryl and your vet..
http://animals.howstuffworks.com/pets/how-to-give-first-aid-to-your-dog17.htm

Bee Sting..no, that is not his name, that is what he got!

My big guy Cheetah got stung by a bee yesterday morning. That pretty left eye was swollen shut and greatly enlarged and it happened quick. He was laying directly in front of me, I was watching the View & I noticed him rubbing his eye with his paw, when I looked closer I could not believe how swollen his eye and jaw had become. (no pic, as I just wanted this allergic reaction to stop.) He weights around 95lbs. I gave him 3 Benedryl, followed by 3 more in 3 hrs. The swelling did start to subscide by evening and he is back to almost normal 30hrs later. I am still giving Benedryl, just not as much...Poor boy, he ran so well at practice Thur.
Bees, fleas, ticks, mosquitos, ah....Spring..
Check out Doggedogdom blog, Rose has a good post on fleas and tick protection. she covers the topic well.....

HOW TO TREAT A BEE STING...BENADRYL AND YOUR VET...
http://animals.howstuffworks.com/pets/how-to-give-first-aid-to-your-dog17.htm