The e-vet said that, given his size, it would be safe to give him up to 50mg of Benadryl. As he had never had it before, I wanted to give a smaller dosage first (25mg), and see how he did, but was prepared to give him more if the swelling went up.
I would think that if it were to cause a hyperactive situation, the heart rate would be elevated, but not necessarily irregular. I, personally, have something called "inappropriate sinus tachycardia" - my heart rate is extremely sensitive and jumps up quite easily. Prior to finding the right meds, it wasn't uncommon for my HR to be over 200 during exercise. They actually stopped the one stress test that I have had, because they were getting anxious about it, despite the fact that the EKG was showing no issues, and I was feeling fine (just tired). It's just speedy, and is over-reactive to movement. Theoretically, I'll "grow out of it."
Baxter was acting like his typical goofball self last night and this morning, which reassured me a bit. Only a few hours of work left, and then off to fetch him and head to the opposite side of town for his appointment.
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- aka "Basher" GSD 9/27/10
Boomer & Star - Kittens of Doom