I'll be happy to share with you what my poultry vet prescribed for my hen that was attacked by a coyote. My hen, Little Red, was in bad shape, she had puncture wounds, her tail was almost ripped off and her left leg was non weight bearing, if she tried to walk it would slip in front of her. It's been about three weeks since the attack and her feathers are growing back, wounds have healed and she has complete function of her leg. Other than ruffled feathers, and a slight limp, you would never know what she went through! It took her about two weeks to really get the leg mobile!
I used peroxide the first time then was told to switch to iodine solution dilute the iodine to iced tea strength, pour over affected areas three times a day, her weight was 6.6 lbs. so she received the Tylan 200 .23 (1/4) cc once a day I gave it to her orally,(I know your roo is smaller but that is all the info I have) I now it's bitter so I would follow it with something sweet.... for pain the vet explained that a chicken metabolizes meds quicker than other animals. this sounds like alot but it worked and I kept my girl comfortable as she recovered......12 yes....that is twelve 81mg baby asprin in 8 oz. of water. I used the vit mineral water Crush the asprin and mix in the water. The life span of the asprin water solution is only twelve hours so it has to be changed twice a day. I really on used ten or eleven to stretch the asprin out but the script is 12.
I fed her whatever she would eat. Yogurt, raw chicken livers, spinach, egg raw and scrambled,bread chicken feed. I also had to keep adjusting her position so she wouldn't get sores. Little Red was placed on a really thick layer of shavings to protect her keel bone. After a week, I start working on her leg with mobility and rubbing it a bit. I know this sounds like alot but I figured she has provided me with eggs for almost two years...so, it was the least I could do! LOL!!!!
I hope this helps. Let me know if you have any other questions regarding this protocol and I'll do my best! Good luck to your little roo!