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.
Dogs have some real memory but it's only extremely short in its span. Most research indicates that a dog's short-term memory is about 10 to 20 seconds long. This means that if a dog poops in the house, for instance, and you scold him about it 5 minutes later, he won't associate the scolding to pooping in the house. He'll associate the scolding with you and pooping in general.