My vet is recommending Advocate for my JRT. My friend's small dog wasn't treated properly and got quite itchy. Vet had to give him a jab to stop poor dog from scratching himself till it bled from mites and said that the meds put on coat once a month would be enough.
I started reading about shampoos/sprays which should repel fleas and mites and there's such a big choice so am hoping that other dog owners could recommend some brands. I sometimes use just any odd shampoo from Pets at Home. He also had been groomed at a local parlour once.
Or perhaps if he is taking monthly medicine I shouldn't worry about buying anything else.