In our Bernese Mountain Dog is a burden of mites was found. It had developed an allergy to mites. Based on the description and the pre-reviews I ordered the medium. Our dog is suffering from itching especially along the spine and on the flanks. The agent was a disaster: Apart from the fact that the itching at all was better, the entire coat to the treated areas was contaminated with oil. It was impossible not "hit" the fur to. Our dog looked as if he had fallen into an oil barrel. Thus, the hair were also stronger on the skin and this "hermetically sealed" led - again - to a HotSpot. So once again shave off hair and the whole theater. I highly recommend this in no way means for long-haired dogs, apart from the fact that it has the itch positively influenced in allerkeinster way with my dog. I had the feeling that even the opposite was the case. Never again!