Orally. Sigh. Usually it is a thick liquid wormer, and by weight. So I just kinda guess their weights ( or I do a heartgirth measurement once or twice a year so I know the average that individual will be), then pull the volume of wormer the bottle suggests for that weight.
(hearth girth X heart girth X body length) divided by 300 = weight in pounds
You just take a tailor's tape and measure around the chest just behind the elbow for the heart girth measurement, and from the point of the shoulder to the point of the hip for the body length.
Of course, that's the easy part (keeping them from knocking the bottle over, etc, is trouble). You then have to catch the individual sheep, who know full well what's coming and how bad it tastes, jam the syringe into the side of their mouth behind the front teeth, try to lever their jaw open in doing so, get the syringe aimed down their throat, and push the plunger. Without losing hold of the sheep, pushing the syringe too far sideways and going out the other side of their mouth, dropping the syringe, without getting stepped on - sheep wrestling at its finest.
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