@aart and OP try these. I use to use the old school snap trap and this in by far superior to me and also much more finger friendly.

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I am worried about dogs and chickens getting hurt by them but you already clarified that. You’re so clever I never thought of a milk crate. I will try that. You’re the best. Thank you.I've tried many traps, but the old style snap traps with the smaller trigger(see pic below) work the best, IMO.
Not sure what you mean by 'animal friendly'?
I set them up where the chickens and dogs can't get at them,
either up high or under a milk crate or wire basket.
View attachment 1941737
Excellent idea.2- If the problem is more about pellets being pulled out and scattered into the litter attracting mice, then attach a small plastic shield to cover the lower ~1/4 of each opening. That will keep the chickens from scattering pellets.
I free feed 24/7. My situation is different from yours. Different climate and Unable to free range. Arts suggestion of trapping now is a good one. One mouse means there are others. One mouse can have a large litter. Each of those mice are able to reproduce in a few weeks. Large litters each...Hello all,
I would like to know how you all feed your chickens. I have a large tote with 8 ports around it, I take it out of the coop at night, and return it in the morning, ( free choice ) . My problem is mice, I dont know if I should feed them in the morning before I let them out to free range, or continue to let them eat when they want to. So I would like to know your thoughts, and see some pictures of your feeders.
Thank you in advance.
Organic poison? It poisons rats with calcium leached from their bones. It claims that if a poisoned animal was eaten it would have a low incidence of poisoning the eater. HOWEVER it warns to not let pets and livestock (code words for "animals you don't want to poison") eat the poison pellets. Imagine the results of a chicken eating poison that leaches calcium from their bodies.There is also an organic method for rodent control. I would place pellets in a chicken un accessible place Like the traps.
https://www.planetnatural.com/product/agrid3-pelleted-bait/