Mftaylor, from the other thread: she is eleven years old and you have had her for approximately a year and a half. You came here originally asking about crating. When discussing that you mentioned her stomach and bowel issues, did she have the digestive tract issues before the crating issue. Did they clear up when you figured out what was wrong with her not wanting to sleep in her bed and then reoccur?
Has she had the itching problem since you got her (if you know her history, does it go back to before she came into your house? If it predates your home, can you get in touch with her previous owner to find out what they tried?) or has it developed since she came into your home? Has it gotten worse with the changing of the seasons as well as the food?
I am wondering if there is something she is getting into and not only having contact with but maybe digesting possibly from cleaning herself like floor cleaning products getting on her feet and then she licks her feet. Any plants that she might be getting a hold of a leaf or two every now and then?
Good luck to both you and the pup in trying to figure this out.