Got home a while ago and it appears that the knucklehead has hives!!! He's been in the house all day, but that doesn't mean that he couldn't have encountered something this morn before I left, or even for that matter, in the house. We have the occasional uninvited guest (bee, wasp, ant). He's about 75lbs and I gave him two 25mg benadryl. He doesn't seem to be having any respiratory problems at the moment, but I was wondering if epipens are useable in dogs if he were to get worse.