The denaturant makes the alcohol taste bad. When a denaturant is added to alcohol it is called denatured alcohol or Alcohol Denat. Denatonium Benzoate is a common denaturant. It a quaternary ammonium compound that is considered the bitterest compound known. Quassin, Brucine and Brucine Sulfate are bitter alkaloid compounds obtained from plants.
Well, there can be some irregular pacing, breathing before the seizure. That can last from a few minutes to 30 minutes or more. The seizure itself should not be longer than a few minutes. Anything over 4-5 minutes is a huge risk for brain and body injury. After the actual seizure, a pet can remain disoriented, but they are at least responsive, for another few minutes to hours.
Epilepsy. There are many things that can cause a seizure in a person or a dog. Epilepsy is a subset of one of the many things that cause seizures. Just because a dog has a seizure does not mean that the dog has epilepsy. Seizures come in two flavors or types, primary and secondary. Some external influence or some outside stimulus causes secondary seizures. With secondary seizures, the source is known.