If the swelling is going further up her leg, maybe you should take her back. Zoe tried to eat a bee and it stung her in the mouth. Poor thing ran around the house crying, I did not no what had happened at first and then she vomited. I had given her a benadryl earlier in the morning for her paw chewing but my dog savy neighbor had me give her another one even though it had only been a few hours. She felt better after that second pill. Maybe Luna does need more antihistamine as Tina suggested.

HUGS