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It sounds like he is suffering from vestibular disease. It's a disease of the inner ear that can produce stroke-like symptoms.
The symptoms include one sided weakness, walking in circles, holding the head at a different angle. These dogs usually eat and drink just fine but have difficulty walking.
You need to return to your vet for different/stronger antibiotics. Some dogs recover well from this. Others will have lameness and will hold their head at an odd angle for the rest of their life.
Your child is safe and cannot catch this disease. It's an ear infection that has gotten really bad. Let me know if you still have more questions.