How big a jail and for how long for aggressive alpha hen?

[EmmaDonovan]

If the problem is just one hen, consider rehoming or culling. It is the best to always work for peace in the flock. A single bully is not worth making the whole flock sick.
When considering which breeds to keep, try to not mix shy breeds with aggressive breeds in the future.

That is sage advice.

 

[SkyAJK]

Consider getting a Super Soaker water gun. It won't hurt your chicken, and can reach a far distance. When you see rude action,,, give it a squirt. Chicken doesn't know where that came from. Assumes that picking on that chicken, results in chicken fighting back.

I do have a soaker water gun at home, thank you, I did not think of that. We had this water gun for my dogs, they bark just about at anything that move and the water gun stopped them. We have not use it for many years now. It is also fun to use the water gun.

 

[cavemanrich]

soaker water gun

I suggested it,,,,, because I have used it.