If your dog scratches his ear and it bleeds, it means that it is very itchy, which is why it is causing such strange itching symptoms. Among them, it is very likely to be caused by parasites, and the most common ones are ear itch mites, scabies mites and demodectic mites. These three kinds of mites can make dogs itchy and suspicious of dogs.

Of course, this does not mean that your dog must be infected with these three types of mites, but it is highly likely. Therefore, to be on the safe side, it is best to take your dog to the hospital for diagnosis and symptomatic treatment.

Coming back to these three types of mites, the good news is that they can all be easily treated with ivermectin, as long as the dosage is reasonable and completely killed. Then it only takes about two weeks to one and a half months for the dog to recover. However, ivermectin is not friendly to Collies because the blood-brain barrier of Collies is not so reliable to ivermectin, so it will cause Poisoning, use should be avoided unless absolutely necessary.

During the treatment process, you also need to pay attention to wearing an Elizabethan ring on the dog to prevent it from continuing to scratch the ears and causing greater damage. At the same time, if the damage is serious, you need to only use targeted anti-infective treatment to avoid the wound from festering and ulceration, depending on the situation. The doctor can evaluate the dog's current condition and decide whether to give anti-itching medication to help the dog overcome this difficulty.