[anonymous]

The pruritus may be unrelated to the food. It may be caused by environmental allergies, the pollen count is high where I am.
Wipe off his paws with plain water and towel dry when he comes in from outside, especially after walking in grass wet with morning dew.
Bathe once a week in a gentle shampoo such as Sergeant’s fur so fresh puppy.
If it continues, I would go by what your vet suggests.