Hi. Last night, which was the 4th dose of penicillin, my buckling couldn't stand up after the shot. He was breathing ok and he never made a sound when I was giving the shot. The neefle went in his hind leg towards the top of leg where I felt most of the muscle. I gave him warm molasses water rubbed him for about 10 minutes while he was held. Put in in the grass to see if he could stand, a few minutes later he was ok. Anyone have clue as to what could have happened? I thought I hit a nerver or something.