Thanks for your response:
1) Over the years he has been on different dog food products. Currently he is on Tesco Prime Cuts which he eats readily with dry biscuits. His condition has not seemingly been affected or deviated with the dog foods.
2) He weighs just under 10kgs
3)The yellow spots come and go and are not in regular areas, but tend towards the back half of his body.
4) No raw areas now. I treat them with Fucidin ointment which clears them up quickly.
5) Not at this time. (The last set of tablets, the Vet advised, would make him thirsty, and consequently, urinate more often. The tablets finished over two weeks ago, but his drinking/urinating are talking time to return to normal.)
Sorry about delay in answering but had to go out. Thank you.