I recently bought a rabbit from pet store and it's been a week that my rabbit hair has changed. It looks like the hair around the mouth, nose and stomach is dirty and wet and it's not getting better. It is just increasing every day, it's making my rabbit really tired and it also smells bad. I feel like it's an infection.
I also have chickens in the yard and sometimes I let my rabbit play in the yard.
He always trying to clean himself and he shakes his body a lot. I have two more rabbits and I don’t know whether I should put them together or not because maybe it could transfer to other rabbits. Sometimes I feel it’s only dirty and I have to wash it, but I don’t know if it's safe to wash him or not.
I want to know what is this and how I can treat it.