This exact same thing is happening to my bantam rooster, 6 months old. Used to run with the "girls", then sat a couple days, 3rd day couldn't get into coop on his own, so brought him in and put him in nesting box on bottom that none of girls use. After 2 days decided to bring him in house. For 3-4 days have been giving him bone stock warmed with tomatoes bits in, his usual feed, some yogurt make with Unpasturized milk (enzymes and good bacteria), sometimes warm oatmeal with the bone stock which he gobbles up. He seemed to weak when I brought him in, he has slowly increased in eating which he does vigorously now, BUT still can't walk! I move his legs around a few times per day and give him a butt wash LOL. His water has duramycin-10 in it. I gave him oregano to chew on . . .I'm going to town to get vitamins for him at feed store . . .what could have caused this and what else can I do???
His poop is solid and normal looking