Q. 8yr mixed breed female itchy skin-on LID food 3-4yrs and all well. Now licking feet, pads cracking-use cone-heals-3 days later licking and limping?
A. She may have developed new sensitivities or has had several existing ones hit at once. For an excellent hypoallergenic food, ask your vet for Hill's Prescription Diet z/d Ultra. The proteins are hydrolyzed, meaning they have been broken down into their component amino acids. They still provide the protein nutrition, but they are in much smaller 'pieces' so that your dog's immune system does not recognize them as a threat. If you have not done so, allergy testing by a veterinary dermatologist is recommended, to determine what exactly it is your dog is reactive to and find ways to avoid or eliminate those from your dog's environment.