How much tetracycline to give your dog?

In general, you should see your veterinarian to get a prescription for tetracycline that is specific to your dog and the infection being treated. Doseage is based upon the dog's weight, the dog's health status (particularly liver and kidney function parameters), the type and location of the infection being treated and the formulation of the tetracycline.

If you're wrong on dosage, duration, or appropriateness, you can make the situation worse by making the bacterial infection more antibiotic resistant -- now you're going to REALLY have Vet bill -- or possibly loose your pet.