Sadie had an allergic reaction last summer that I believe came froma bee sting. She went outside inthemiddleof the night and then kept itching at her face. I got up gave her some Benedryll and went back to bed. She didn't stop and didn't stop, so finally, I got up again and her whole muzzle was swollen. We made an emergency run to the vet at 4 am where they gave her steroids and within a few hours the swelling had gone done. I am sure to ALWAYS have benedryll at home and with me when we go to a park. etc.