The seizure alert dogs could predict a seizure when is coming. How can those dogs anticipate a seizure? Well, the dogs have advanced perceptual abilities, there’re many jobs which dogs invented for themselves. The seizure alert dogs were trained to respond to a seizure, those kinds of dogs were able to develop a skill using their intellect.

On the other hand, Clever Hans, the horse that apparently could calculate. Being interrogated by his owner, he could response different quizzes. But Oskar Pfungst explained Clever just could answer a quiz if he could see the questioner. Even so, as seizure alert dogs, he had the ability to train himself and acquired a new talent.

In short, seizure dogs and Clever Hans found the way to train themselves using their perception of the situations. Seizure dogs discovered how to resolve when a person has a convulsion and Clever Hans found how to read a human. These animals had no help from humans, and they achieved how to evolve their capabilities. If this is not a clear case of animal intelligence, I don’t know what is.