Straight Ivomec is pretty harsh on a dogs throat, vocal chords, etc. It's best to cut it with something. I personally use Propelyne Glycol. 1cc Ivomec to 9 cc's PG, then use that mixture.
You are correct Bryant in that. I forgot that I mix it with water 3 to 1 when I give it. Its some nasty tastin cause if you miss it goin down their throat they will spit and sputter for awhile. LOL