This is really one of the most aggravating problems managing a flock. I currently have two chickens with practically no tails. Funny-looking, indeed.
One is my Buff Brahma alpha rooster Penrod. He lost over half his tail feathers while settling a score through a fence with the other roo. They're broken off, so he won't grow them back until he molts in a few more months.
The other tailess wonder is the lowest-in-the-pecking order Buff Brahma pullet Joycie. She's missing a lot more than just her tail, being subjected to almost continual picking and pecking from twelve other hens. Many of her feathers that were completely plucked out are now in the process of growing back in. However, like Penrod, her tail has been broken off and won't be replaced until her first molt this fall.
As for solutions, there are two that I've employed with moderate success. One is to protect the victims by covering their vulnerable backs and tails with saddle/aprons. I made them myself since it's hard to find ready-made ones that fit properly. This allows their feathers to grow back without being constantly picked back out as soon as pin feathers emerge.
The other remedy is to install pinless peepers on the primary culprits. I had one such hen, and wearing these little "specs", which inhibit the forward vision, has all but broken her of this fixation on feather picking. I'm planning on removing them soon since she's had them on for about two months now. They fit onto the beak with prongs that are inserted into the beak holes that hold the device in place. There's a little discomfort inserting the pinless peepers, and the nostrils are tender for about a week, but after that, the chicken adjusts. They have trouble seeing straight ahead, but can easily see side to side and down and up. You get them on line at
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