Dog with swollen lips. help!?

could he have possibly snapped at a wasp or bee and been stung? this time of year the stinging insects are really moving, I think I would keep a close eye on him and if the swelling is still there in the morning call your vet, so many things could have happened if he will allow it try putting ice on his lips it may help reduce the swelling. I just went through the same thing with m y weimarainer his was a wasp sting, good luck