You may need to try several different limited-ingredient diet foods. Your dog could be allergic to the potato, the rabbit, or something else in that particular brand. Try a different brand with completely different protein and carb source.
It takes a lot of time to try a diet. You need about a week to switch. Then, you need to spend 2 or 3 weeks on a diet before you know it will work. It’s kind of frustrating when you don’t get immediate feedback. You have to wait for the reaction to the old food to subside before drawing a conclusion.
One of my dogs is very allergic to chicken and somewhat sensitive to rice. When she was on commercial food, she could eat food with fish, lamb, and potato.
Now that she’s on a raw diet, she gets lamb, goat, beef, mackerel, and canned salmon without any itching issues. I accidentally gave her a ground organ blend that included some chicken and the itching came back.
https://ecopetlife.com/best-food-german-shepherds-skin-allergies/
