But not many scientists would have done what Pavlov next did—which was to spend the rest of his long life giving stress-induced nervous breakdowns to dogs, after which he would try to reverse the breakdowns, all the while keeping careful experimental records. He found that 1) he could classify dogs so as to predict how easily a particular dog would break down, 2) the dogs hardest to break down were also the hardest to return to their pre-breakdown state, 3) any dog could be broken down, and 4) he couldn’t reverse a breakdown except by reimposing stress.
