I am not sure about dogs, but i know that it is true to some degree in humans. High intelligence will often learn faster, but require more * reward * over time .. also tends to question tasking, whereas low intelligence takes longer to grasp the task, but once its learned, its there forever. I deal with intellectually disabled kids and teens quite often, and it is well nigh impossible to get one of them to do something they have learnt not to. one Downs syndrome man (24) i take swimming had to have his mum come along daily for the first week.. cause no one but his mum was allowed to take his shirt off . Once he got the idea that i was permitted, he was cool, but if i have a sick day, his mum has to come as he will not let the relief person take it off. His mum taught him that when he was 5, and it has stuck like glue ever since.
Ysabel