Hello, glad Sweep is doing better now
Her poor paws, that sounds horrible. I have not had experience of chicken causing an issue for Daisy, but she did have tummy troubles when she came to us, and research shows that chicken is a common allergen for dogs. It is definitely worth excluding it from her diet. I tend not to use a lot of chicken based food or treats for Daisy, just in case. She gets a lot of fish, in fact I have just has fishy kisses as she had sardines for breakfast
Turkey is a good alternative as it is not used so much in dog food. Definitely worth a try.