Thank you everyone!

I did a thorough cleaning and washed all of her clothes, and she has only had one bite since. I guess it was fleas after all, although the dog hasn't been scratching. In the past we had tiny flea bites on the ankles.

So don't worry, my hens are staying. Thank you for the advice on looking for mites and lice. I will definately hang one of those pest strips; that sounds SO easy. I imagine that now the hens are getting older they will be more vulnerable to disease.

Thanks again,

Julia