Hello I am hoping someone can help

I have a small flock of two year old RIR hens. In the passed few months I lost two, both exhibiting the same symptoms: Start looking puffed up, wont return to cook, won't roost up high, dirty poopy butt. And then they become very weak and die. My chickens are free range with some layer pellets available to them. They spend a lot of Tim around the barn and horses, and could be eating oats. Would that kill them? I now have a third chicken with these symptoms. I have taken a few pics that I will post. I soaked her last night and gently felt all around her vent, it feels soft, although her abdomen feels tight.

Post about your sick chickens here on the emergencies thread:
https://www.backyardchickens.com/f/10/emergencies-diseases-injuries-and-cures

Give as much detailed information as you can so the members over there have the best chance of figuring out the problem.

I'm sorry for your loss.

Welcome to BYC! I'm glad you joined us!

The cause could be that your chicken has diarrhea, which can be caused by bacteria, fungus, or a virus in digestion track. You should separate the ill chickens from the rest, and treat the ill chickens, as well as the res of the chickens. Droppings that build up around the vent block eggs and feces from coming through, which can threaten the chickens life. Try giving your chicken some probiotics, which should help with the diarrhea. Diarrhea can cause weakness and death if untreated.

Clean the coop real good with citrus oil soap and make sure you get the roost extra good spray full strength at each end and joint of bar of the roost. Leave it on there full strength so it kills what ever bugs is there or comes off the chickens and it will get them. So now their will not be a mite or lice problem. Then worm all your chickens, I've found in the drinking water type works real good just put it in their water for a full 24 hours and its their only source. Then another thing you need to do is, at night while they are on the roost you can treat each one easy by taking each one and putting some olive oil or other oil you got at home, all their heads combs, beaks, feet and legs up to feathers, just put it on you fingers and rub on gentle at first they don't like after little while it's ok with them. Then put Poultry & Garden Dust in their dust bends or area they take dirt baths. They should have free choice of some kind shell replacement, grit and some kind of feed. After all of that and they haven't gotten better, take one to your local Vet. and have a look see. Good Luck

LOL I knew I was forgetting something. As @ChickenLife said, you need to worm your chickens..

It would be good if you could take one of your dead chickens to the vet for a necropsy - to find out what is going on - before you lose even more. I hope you can get a diagnosis and correct medication for them

There's a lot of great peeps here! Feel free to ask lots of questions. But most of all, make yourself at home. I'm so glad you decided to join the BYC family. I look forward to seeing you around the run.