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Doxycycline or Tetrycycline(LA 200 is also tetrycycline), sounds just like tick fever, the kidney failure and internal bleeding are definate symptoms of tick fever. And like your others, without very quick doctoring for about 10 to 15 days(to keep it from coming back), the dog will die. Most dogs don't just come up with kidney failure. I agree that some do but most of the time it is caused from something and a large percent of the time it is tick fever!!