This post got me to looking around for sheep handling equipment closer to home. I found this one, which is easily transported. The description reads "Whether you have 50 or 500 ewes you need a decent sheep handling unit and here it is. Featuring internal unloading and sorting pens, forcing pen, race with guillotine gate & footbath and exit pens. Complete with drenching gun and 2 bottles of drench."
Naw... Here's how it works: sit in the floor, move the sheep around, build fence, etc. Make sure you put it away when you're done, or Mom will get mad when she steps on one of those drench bottles.