Okay, well here's my story about that. I had very young kits that weighed about 2 lb. One kit's ear started to droop so I thought I would give him some ivermectin in case it was ear mites. I measured the dose of injectable 1%. I did not inject it, I just put it on the back of his neck. Because one of the rabbits in the litter had blue eyes I was a little concerned about the Vienna Gene but he was fine. The next day another rabbit's ears started to droop so I grabbed the stuff I had mixed up and dosed him. Gee, that looks like a lot more liquid than yesterday. I wonder why.... Oh, I used the wrong mixture - I gave a two and a half pound rabbit a dose for a 25 lb animal. Needlessly to say I didn't sleep much that night LOL. The next day he was fine and he's actually the biggest rabbit of the group so it certainly didn't stunt his growth. And now his ears are finally standing back up. (This is Hershey I'm talking about LOL his ears are just so huge but I guess he is growing into them.)
I dilute it so it's easier to measure. As it comes it's 1 mL per 110 lbs, so if you put 1 mL with 9 mL of saline or water (I can't remember what I used), then it's 1 mL to 11 pounds which is much easier.
So, at least with my rabbits, the non-lethal range is quite large. And even the blue-eyed one had no problem with it.
- Liz
p.s. nobody actually had earmites, just giant ears, I guess my breeding program is successful LOL