Sheep update

So, before the Big E I dosed the puniest lamb again with Ivermectin.    I took a look at everyone when I got back and she was still not pink/red.  So, at this point I believe the Ivermectin is just not working.  She's a bit better, but not normal.  Then, yesterday, when I went to let the flock out of the room I keep them in when I work Joe, I saw the ram laying down again (he's lazy) and decided to check him. He was not real pink either.  What the hell is going on?  Maybe they normally are not that pink?  So, I called the vet and did not hear back, but am going there to get Valbazen today, and be done with this.  They are all acting well, but this is not cool.  I started graining them yesterday, so from here on out they will all get a small amount of grain, which I hope the lambs will do very well on.  So, that's it for now, will update as things either improve or not.  Part of me says send the puny lamb down the road, because one weak animal can really mess things up for flock health, but the other part of me says this is my fault for not being more observant and pro-active given the mild winter we had....