Good morning Laura -
If Junior's numbers are that low, I woudl NOT shoot. Others with more experience will probably be able to suggest what to do, but I don't shoot until Grayson he is at least 250.
From what I recall hearing, and my observations w/ Grayson, the food usually spikes his number about 30-40 points, takes 2 hours to clear, and when you've fed him, because the number is raised by the food, I believe that you're supposed to shoot the PRE FOOD number. I'd keep checking his numbers every 1/2 hour or hour, and if 2 hours passes, and it's at least 250, then I'd shoot. Depending on how low or high it is, you may need to shoot a reduced dose. At least that's what I was told.