Having been a medication nurse, giving shots to my goats was no problem, some worm medication was I.M. But I don’t think I would try a horse, if they don’t like the way you give them, one kick and your in a world of hurt, if you are still alive.....LOL
I had one rabbit whose teeth wouldn’t stop growing even with junk to chew on....about every 2 months I had to take nippers and cut his 4 front teeth...those suckers can give a hell of a kick if you don’t have a good hold on them....a gal told me it was a genetic problem with some rabbits...I didn’t notice it until I took a good look at his mouth and the bottom 2 were full of hair and within a fraction of an inch from going into the roof of his mouth.....If I was ticked off with hubby for some reason or other I asked him to hold the rabbit while I clipped its teeth...he didn’t think it was funny, but I did..(I am a bad girl)
My ex-wife wouldn't put up with a doe with a bad disposition either.
One morning she came in and said "Get me a band-aid, and kill the doe in cage #3." Snarling and snapping were fatal around that ex.
/johnny