Sick chicken

[J Kay]

Have a sick girl in my flock. Almost 2 year old ISA brown. Not acting herself, but still moving around. Has a very gross dirty butt. Yellow almost egg like poop. Today is day 3 she's been like this. Suggestions?

 

[BDutch]

Are you sure it isn’t feather lice?

 

[Blue Raptor]

Have a sick girl in my flock. Almost 2 year old ISA brown. Not acting herself, but still moving around. Has a very gross dirty butt. Yellow almost egg like poop. Today is day 3 she's been like this. Suggestions? View attachment 2769758

Soak that in warm water and soap, then send pictures of the thoroughly cleaned vent area.