Does he still have the possible tilt?
I'd probably get a dose of ivermectin into him asap just in case. It's one of those things you've got a decent chance of reversing as long as you treat it quickly.
We noticed a barely-there tilt on one of our rabbits (our oldest one) a few nights ago, and pried his teeth apart for a dose of ivermectin immediately. He now has a full-blown tilt, but he is eating and drinking well, and I've read that we should start seeing improvement after his second dose.
From Barbi Brown's site:
Ivomec 1% injectable solution for cattle given orally at the rate of 1/10cc per pound of body weight. Dosage repeated in 7 days. Then followed at 3 month intervals as a preventative. It is critical that the dose be repeated in 7 days at that appears to be the life cycle of the spore. We generally see improvement in the condition after the second dose of Ivomec.
https://barbibrownsbunnies.com/wryneck/
She uses a couple of other things if other issues like worms or infection are suspected, but this is the basic wry neck treatment.
I use 1.87% ivermectin horse paste, about a pea-sized amount. If I do not see enough improvement after the second dose, I will probably give a third dose another 7 days later.
We already have one wry-neck bunny. We didn't discover his tilt until it was bad and his eye was darting. He is well from the E. cuniculi, but he never recovered from the tilt. So we have a spoiled disabled house rabbit. :roll:
You can get ivermectin for $12 or less at a feed store. Make sure ivermectin is the only active ingredient, because it is sometimes combined with other meds that are not rabbit-safe.
Ivermectin is risky in animals with the Vienna gene, like Dutch rabbits.