Ask a Dog Vet and Get Answers to Your Dog Veterinary Questions
Hello, I am sorry to hear you are worried about Mikie. I am a veterinarian and will do my best to help.
Did you have his ears checked? He could be doing this because of an ear infection, a polyp in his ear, or parasites in the ear. There is a type of mange, fairly rare, called Sarcoptes, that make the ears itch and the hind leg go up and down.
Is it his left leg he thumps, or both? It sounds like the thumping could be from the ear infection. If there is infection, or yeast, or inflammtion in his ears, he may need more than cleaning and enzymes. He may need anti inflammatory drops, or somthing for yeast. Yeast infection are very itchy, and often cause a brownish discharge.
If it is his left leg, it probably is his ear. If her were mine, I would try to get the ear cleaned out down to the ear drum and start him on drops that contain something for both yeast and inflamamtion and possibly start him on some pain medication. The best things to treat him with would be by prescription, so seeing his veterinarian is best.