First post from long-time lurkers. We bought a couple of scrawny chickens from a dodgy back yard breeder. Both had pretty pale combs, patchy feathers. One had a runny nose and would cough/sneeze. Months later and one of them, the one without the runny nose, is very healthy - plenty of weight, bright red comb, and laying regularly. The other one, the cougher/sneezer is still very small and looks funny - like she has no neck and a puffy chest. That said, her comb did improve and she was behaving like the other hens and even laid regularly. In the last few days, she has become sick, exhibiting the following symptoms: Pale comb Severe lethargy Isolation from other hens Limited or no eating or drinking Vomiting yellow foul-smelling liquid when picked up Rattling sound when breathing Very watery poop Foul-smelling breath (actually started a few weeks ago) We did notice some lice on all of the hens and have dusted the flock, but we doubt this is the cause of such acute sickness. At this point we think it's sour crop and have done the following: Dusted for mites and lice Isolated her indoors Manually induced vomiting to empty her crop Fed some anti-fungal medication oil and yogurt Fed some water We will probably repeat the above until she either improves or dies. Any advice to the contrary? Is she too far gone, and is euthanasia the only humane option? Slow / lethargic reaction (WARNING loud sound): Rattling breath (head tucked in wing): Thanks in advance for the replies!