Oh man! Curly was stung when he was a pup and only had one hive for hours, we benadryled him up and no more formed. 5 hours later he was covered in hives (we assume the Benadryl wore off) and had to be taken to the vet. He was 6 months and had just gotten neutered the day before so there were some other factors that made his immune system not as strong.
But fair advice keep an eye on her for 24 hours
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