Add a tea seaweed powder to the diet daily it’s cheap as chips from any farm shop or online very beneficial if the immune system is low it’s full of beneficial minerals an amino acids often over looked in the dog game google it have a read up on it I got told about it years ago by someone who bred sharpies think that’s how you spell it they were telling me as a breed they often have itchy skin and bad fur hair loss they had been battling with problems for a while back an forth to the vets trying different things they told me it was a cattle farmer that suggested seaweed powder added to the die