“Percy, for instance could be shown behaviors and would remember them, whereas Watson was taught certain behaviors, by having us catch him doing them and calling out the word for the action.
For example, Watson learned to sit by sitting and having us call out the word, sit.
Percy is five months older than Watson, but we trained them together, although Percy was already housebroken.
Percy is eight and Watson is almost eight.
About 3 and a half years ago Percy had an infection which turned into an auto immune condition. The illness led to chronic inflammation of his eyes and glaucoma with scarring and he became blind.”