Anna, don't be alarmed if the Benadryl makes him sleepy. My son was bitten by something (we don't even know what it was) and it caused raised blotches all over his skin. He was prescribed Benadryl by the doctor also and fell asleep for 4 hours. We couldn't even wake him up for dinner! LOL! Hopefully Emmers will "sleep off" the rest of the pain. Poor pupster!!!