On a recent veterinary talkback radio program, a caller had tried all kinds of prescribed medication for her dog’s constantly itchy skin. When it didn't help she changed vets. The new vet suggested avoiding foods with preservatives and colouring and to add fish to the diet. Within a month the condition had improved and the dog had also lost three kilograms - it was a breed that is prone to put on weight.  - Tom Olthoff, Adelaide