You should induce your dog to vomit and that will reduce the amount of drug absorbed. If the dog did not get the full two grams, it should be alright. The side effects and toxicity of this medication in dogs possible include renal damage, liver damage, seizures, hyperventilation. The safe does in a standard 35 kg dog would be around 1 gram per day. Keep a close eye on the dog and if you think the dog may have gotten more than 1 gram, I recommend that you take the dog to your nearest veterinarian for assessment.